She shot him on the side of his chest, but fortunately he was not killed. He would make them boring on purpose to possibly prove a point. Again it was glorifying something thought of as being extremely pointless. In the late 70's he began to use sex and nudity, featuring films concerning sexual bondage. He may have been simply looking for a shock value content.
Many artists work off shock value, it takes only the true to admit it and still continue with it.
The last and most important influence on Warhol was his mother, Julia Warhola. When Andy first arrived in New York, he would share apartments with friends and acquaintances. Eventually he could afford a place of his own. Then his mother suddenly arrived in town and moved in with him. Her reason was to look after him.