I have studied philosophy and logic at uni and I think NTs can be just as logical/reasonable when taught. The logic we use even in philosophy is pretty simple, anyone can master it. So it's likely not a matter of capacity. I think that likely Aspies find logic and reasoning more appealing and more useful given our lack of social "common sense" in interacting with the NT majority. I know Aspies who are pretty unreasonable too.
Let me hypothesize. Aspies have poor social skills and can only get ahead by honesty and actual achievement. Logic/reasoning are critical for honesty and achievement. Aspies find it more profitable to be logical/reasonable. (By reason I mean informal logic). NTs, especially the socially successful kind can get by just as easily by flattery and other dishonest means, not available to us. They learn through experience that often, appealing to the emotions of others is more important than begin reasonable. They invest their time accordingly and become better at wooing people rather than talking sense. I am just saying they are more likely to do so as they have more reason to.
Let me hypothesize. Aspies have poor social skills and can only get ahead by honesty and actual achievement. Logic/reasoning are critical for honesty and achievement. Aspies find it more profitable to be logical/reasonable. (By reason I mean informal logic). NTs, especially the socially successful kind can get by just as easily by flattery and other dishonest means, not available to us. They learn through experience that often, appealing to the emotions of others is more important than begin reasonable. They invest their time accordingly and become better at wooing people rather than talking sense. I am just saying they are more likely to do so as they have more reason to.