Having kids is the default, so there shouldn't be a "reason" to have them.

A father of 2 small ones here, going for a 3rd this year.

I always wanted to have children, as many as I could. Three is probably the most I can agree with my wife on, since we are not the youngest anymore and she is not as excited about children as I am (she also carries most of the burden overall).

Even though I know I cannot influence how they turn up, I see a lot of value in the process and in doing my part.

It is kind of incredible that there is an uninterrupted chain of life from the beginning of it to you, and the fact that you would end it for no good reason is just plain sad.

Humans are the most complex things in the universe (that we know of), and you can created a new one easily. Why would you NOT do it? Just to "enjoy" yourself? Why work if there is no one to do the work for? Why earn money if you can't spend it on your offspring?

Also, if the population collapses and there is much less people in the world (which seems like it sooner rather than later), than all the people focusing on a "career" will quickly loose their meaning in life.

There is no meaning without kids. Kids are the meaning. Everything is derived from the fact that there are other people. Make some, as many as you can.