Why can't we make oil co. and other big corp. mandatory put 3% of their gross profit to help the poor.?

this is aside from some of the charitable contribution that they give to ease their tax burden, make the 3% available by giving the poor and disadvantage of this country more on education social needs, and of course job generating causes, pls.do not just give this as some sort of welfare but as something thats available to the poor and disadvantage that will help them uplift themselves and help them in the long term, not in short terms only.