Not everyone who uses drugs is a drug addict. Drug addicts can also overcome their addictions. Becoming a parent can provide the motivation necessary for overcoming addiction, although obviously that is not ideal. But there’s never a perfect time to have children and if every couple had waited for such a time, no one would exist. There are also some highly beneficial genes that are linked to addiction. There are also drug addicts who are good parents - not every drug addict is dysfunctional. How exactly are we defining addict?
I am very much a pronatalist, but I do not think that everyone should be having kids, and I’d say that most people having children these days are the wrong people and are not doing a good job of raising them. I think only people who can give children a good life and really want children should have them. But I think those people should absolutely be encouraged and supported. Life is a wonderful gift, and most people are glad to exist. For those who do not wish to, assisted suicide should be an option.
People have children for all kinds of reasons, including selfish ones, but there’s also a selfishness to not having children when you would be a good parent. So many people I know these days who would make good parents have chosen a childless life because they want to pursue personal hedonism. I can see a little that is more selfish than that. It means they’re only taking from society without giving anything back - and the demographic collapse coming due to falling birth rates will be disastrous indeed. If only the worst people had always reproduced and the best had never procreated, just think how much worse off humanity would be.