I've had to work with homeless people before. About 50% are people who don't want to be homeless and just need some help. The other 50% are people who are homeless because they've shit on, abused, and taken advantage of their friends and family so often that they've had enough and quit helping. They're the people who aren't just addicted to drugs, but they would be total pieces of shit even sober. They don't view you as a human being, they view you as prey - you're just another means for them to scam something and they don't give a shit about human decency or morality.

Most people would have sympathy and tolerance for the homeless if such a large proportion 1. didn't piss/shit all over like animals and 2. didn't leave other trash and dirty needles everywhere. Such assholes can't even be bothered to use a McDonald's restroom (unless they're injecting drugs) or a public trash can. All these people deserve is to be put on the moon so they can't stink up streets/stores with their feces or harass people minding their own business.

And most people demanding that everyone else have sympathy and tolerance for the homeless have the privilege of not having homeless on their doorstep.