actually, as I was just reconsidering the whole business: have you ever considered the following, concerning this astounding adversary of yours - who left his things in the very middle of the bench of a disabled changing room on purpose: there is need of an explanation that actually explains this matter in a way that it appears a perfectly normal response. such a person we must think up. now, this extreme and obviously blindly raging response is, I think, a bit too childish for anybody of grown age even if e.g. physically disabled - since this person would know it was kicking about another disabled person's things. seems an unusual act among the community of the disabled. then, it is even too childish for a child. a child would not act that way. therefore, what forms in front of the inner eye of my ever and always pondering and scheming mind is, that this act has not been comitted by anyone disabled physically. rather, it may have been comitted only by one who is disabled mentally in one way or another. now, in what particular way we shall see now:
now, I cannot but imagine anything fitting this criminal profile better than this: an extremely pedantic, compulsive-obsessive person, locked down by extreme exposure issues - fearing any form of contact as the plague, and thus overreacting with complete destruction of the evil intruder. of such only a highly compulsive-obsessive autistic indivudal with sensory issues is capable. more so it seems so very typical that I can hardly imagine anything else but him, the autistic. a prick of a pin, and yet instant ultra-violent-response and no fifty shades of reconsideration whatsoever.
imagine being this autistic individual: someone dared to touch your things! you were absent for only one second, and now, your carefully and centrally placed things are moved into a state of neverending chaos and doom, and all this seemingly by an inconsiderate neurotypical dimwit. now, all the things are contaminated, befouled and depraved in their virgin state. now, he - he cannot stand this.
what is more, by this touching of his intimate attire - which this highly autistic individual is then to wear on its bare skin [!] - he feels violently exposed and intruded into his rigid and clocklike working, overstepped in his highly protected and highly fortified autistic boundaries - and this by miles on end.
"an outrageous crime!" he thinks - no, he shouts. in his mind, though, because shouting would be an exposure and an evironment-to-self-related act, and that would be total exposure meltdown. this must be prevented at any cost. naturally, he goes on thought-shouting, thought-spitting and thought-hissing: "this is a proper scandal!! I shall call the police! this brutal beast. hah! never trust the NT world! I knew it! I dare not lay my hands on this ghastly gloob."
he continues thought-angried, all this within no more than two or three seconds: " this cannot be tolerated. I cannot tolerate it. I am not tolerating it! I am blowing up this every instant!! this insidious indignity shall be repayed! twice!! thrice!!! instant and total retaliation, swift and silent. I will destroy it this scum-being!!!" then, like an aircraft powering up its 20.000 HP turbojet-combustion turbines, the very quiet and usually peaceful special-needs-autistic switches to overload autistbeserk rage mode and viciously enrages upon your things like a hurricane, thus having his revenge. he is very angry. he could murder you, but yet he would not do this, because of his exposure issues. afterwards - the retaliation will not have taken more time than 10 to 15 seconds alltogether - autistbeserk rage mode is switched off, correlating with the slow cool-down of a turbojet-combustion turbine, slowly humming down from a thin high-pitched screaming wirr of full-thrust to a deep and spacious rumble-vibrating bass. this is followed, possibly, by a few deeply wounded sobbs. shortly afterwards - once he notices what he has done, and once he sees looming up the hideous threat of his deed found out - impending crushing environment-to-self-relation and thus horrifying exposure, there is but one solution: instant flight. so whiskwhisk, away he flees - or away he marches, that is, in his very quick rigid stick-like walking style staring at the floor constantly, as if hypnotized by the gaps in between the ceramic tiles of the pool area.
now, if I were you I would return to the swimming club, and this on the same day of the week and the exact same time the incident took place. you will need to arrive an hour early - at the very least - for observation, for which you desire an unsuspicious observational lookout point: keeping in good view the entrance to the disabled changing room. I suspect that this is not frequently used so it will be easy to spot our routine-liking villain - by his way of movement and OCD-patterned behaviour, his careful an precise robotic actions, his careful distance to others and his, possibly, a bit out of the ordinary clothing tending to his special sensory needs. this only, that is, if he proves the compulsive-obsessive autistic scoundrel I expect him to be.