They may or they may not. It depends on the reasons for avoiding a pregnancy. Medical reasons, considerations of age or serious economic hardship are valid excuses for childlessness. Deliberate childlessness for frivolous reasons is immoral. We are talking moral law, of course, not legislation.
“Deliberate childlessness for frivolous reasons is immoral”
Well that is a very subjective statement. Who gets to decide what is frivolous or not? Whose morals do we use to judge these selfish bastards that refuse to have kids?