(I don't understand that either because people are only really doing that for themselves..the dead people won't know?)
Think it's sometimes a gesture, when people are affected by something in some way that makes them angry or sad that they have no control over. Like a tribute, but also a way for them to mourn an occurrence that affects them.
For example when the people at the mosque in quebec city were killed, many local people placed flowers and notes to let the survivors know that they were in sympathy with the people who mourned them, and that they didn't agree with what happened. To let them know they were not alone. It's probably a way for people to not feel powerless by doing something.
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