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Probably because most kids younger than three or four don't care much about what other kids feel. They only know that THEY'RE having fun, so why should they stop just because some other kid wants in on the action? Better not to bother with logic at that age. "Okay, it's Timmy's turn now, and then you can go again." And then enforce it. Even my 19-month old understands that one (even if he doesn't like it and isn't afraid to make his displeasure known).