So basically when I wait in line and someone bumps into me, says "oh, sorry" and I say "hey, it's okay, no problem" that's worse than making a big scene, calling the police or beating her/him up?

Okay, maybe you wouldn't apply it to accidental stuff, but even then, that I can forgive others does in no way mean that I will forgive them on the spot or think that their deeds should not have consequences, especially if they had severe consequences for others.