Why should muslims give alms charity

As the Prophet Muhammad, peace be upon, once said, “Charity is a necessity for every Muslim." He was asked: "What if a person has nothing?" The Prophet replied: "He should work with his own hands for his benefit and then give something out of such earnings in charity. Its in the 5 pillars of islam in fact the third pillars. so we Muslims do it, 

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well first we can compare on what the slave masters ate and what the slaves ate well the masters ate fancy great food like chicken rice mash potatose and stuff like that and slaves ate well food that your not suppost to eat like the weird parts of turkey and chicken and slaves master chilled beat and eat and slaves work get beat and get little of sleep there you go