Because I dont want the most vulnerable folks in our society to just fuxking die. People have chronic conditions that require daily medical care that would not be available for the vast majority of folks in an anarcho capitalist society, if they were available at all. I used to love fantasizing about zombie apocalypses and the fall of society myself, untll i realized my partner who is a Type 1 Diabetic probably wouldnt live long in that future. Wanting an anarcho capitalist future is the highest indicator that you live a life of extreme privilege and dont care about fellow human beings.