If you think people can't be subjected to the same standards as everyone else, so that all can enjoy our parks and libraries, try washing your laundry in the capitol's reflecting pool and see how far your argument gets you. As for the homeless being normal folks, bushwah. Study after study has shown roughly 75% are suffering from a mental illness, drug addiction, or both.  And finally, commandeering a public space, stealing electricity, and leaving behind garbage, needles and piles of human waste is not my idea of law abiding. 
Until we stop being foolish about this issue we cannot help these people. I've worked in shelters and with this population, and feel strongly that thinking of them as normal folks perpetuates the problem. It's a severe problem, requiring intense solutions. Letting them run riot in our parks and libraries is NOT the answer. 
As long as you insist on defending their behavior you alienate the people whose taxes will be needed to pay for the solution.