dear Mr. Manohar Kumar,
There is unemployment and poverty even in USA.
The social Security may give the people food and a place to sleep
(I hope it does)
But there will be other needs for which people need money.
There is no shame in asking for help from people who are willing to help.
They won't chase, hunt, touch and bother the passers by.
My sons never pass by such a person without donating at least 1 or 2 USD.
Once two persons were siting together. Probably the passers by had given them one dollar to be shared .
When they flashed the victory sign that they need at least 2 dollars, one for each, my younger son who did not smaller changes gave 5 bucks.
Their eye popped out of their sockets and they blessed the whole family and the generations to come.
People are so similar everywhere despite the difference in their culture and skin color.
Now a days my younger son carries a few 1 dollar bills just for donating.
Those who do not hold placards sing / play any musical instrument and leave a real top hat for collecting the green money.
Usually the top hat appears filled to the top.
Or they may perform some street shows, juggling acts... anything to entertain us before asking for our money.