The impulse to compassion is not wrong.

[Jackpine Radical]

We can be deceived, and that is unfortunate. But it should not alter your compassionate instincts. This is sort of like turning up one case of welfare "fraud" and using it to attack the whole system of social safety nets.

Yeah, sometimes you'll be wrong & someone will get away with something. Most of the time you'll be right, and will have done something great. Personally, I give money to down & outers without much worrying that they'll spend it on a drink. Hell, maybe they need the drink. There was a time in my life when I did.