Because not everybody stays 100% rational "in the moment" and some of us are by personality (or having been raised in Brooklyn
) under stress subject to unwise reactions like "that sucker has my handbag!" (or "who does that young whippersnapper think he is?") which may not be sensible but there you have it...on a rational and legal basis I agree this was foolish but...we are human and yeah I'm guessing they wanted her handbags on principle.
I realize "in the moment" it is difficult to maintain rationality. And I agree with the principle of "how dare this person get away with this if there is something I can do about it." So on this we can agree?