A human being has the free will to determine whether they want a better life, and the motivation (or not) to make it happen. Getting help from people is great, and encouraged, but it is ultimately THEIR responsibility. An animal cannot make that choice, especially if it didn't grow up having to scavenge for food or learn to hunt. That is why it's relevant.
Blaming people for being poor is honestly disgusting. You don't know people's situations or the circumstances that led them to be homeless. Maybe they have a medical problem that caused them to enter debt, or maybe their workplace went bankrupt and laid them off. Have some fucking empathy.