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Yeah...why don't they go live somewhere el.... oh right
How dare they show the reality of what's happening in many many countries. There's whole families having to live on tents. The drugs theyre on? Where do you think they came from. Any help for the homeless to get a home or healthcare? Your government created it, they should solve it (but that wouldn't be beneficial to them. Or if it appalled you much, find a way to help and contribute rather than walk by and turn your nose up. 
Your cavalier attitude and disdain for your fellow HUMAN- beings might not last forever. You're closer to becoming 'one of them' than any of the upper upper class. Have some compassion and be curious as to why they may be in that positron. If you care for Vets at all, maybe go see how many are there and ask yourself why
Last question to ask yourself maybe is, why does it make you uncomfortable?  Why does it make you angry? They're trying to survive and oooh sorry you have to step over a few things to get to Starbucks.
Its a shame, that so many people are homeless for a first world country.