People driving in their cars who whistle, cat call, or yell at people walking on the street

I don’t know if this happens to guys, but I’m guessing that the majority of girls have had this happen to them – while walking down the street, minding their own business, a girl or group of girls have been whistled, cat called, or yelled at by a guy or group of guys driving by. Now, here’s what I’ve always wondered – guy or group of guys, how does this help you? Does it just make you feel better to get that off your chest? It’s not like I’m running after you, begging you to stop your car so we can meet. So what’s the point?