The issue is that in the past, if the parents were bad, then the kids would just die (and the parents probably wouldn't live that long either), and so the problem would take care of itself. But now things have improved just enough that death isn't an issue, so we're stuck with all these people who (according to the natural state of things) should have died.

Now you can debate all you want about whether these people have the right to live or not, but the fact of the matter is that their existence creates a new downward drag on society that did not exist before, and they threaten to bring down the rest of us if we don't do something about it.

The birth rates in the western world are already low enough that populations are decreasing excluding immigration. If your suggestion was implemented, they would literally go extinct in not that long a time span. Not sure I'd call that outcome a bingo!

Just because everyone in the world has the right has to be parents, it doesn't mean that it is right for them to be irresponsible.

Of course, in that case, if you want to argue, they have all their rights to be irresponsible as well as long as they don't break the law.

Now, if the society has come to this point that they value irresponsibility so much so that they argue for it, then we have gone a long way down then.

>everyone in the world has the right has to be parents

are you sure? For example, the freedom of speech is in US Constitution, while reproductive freedom isn't there. Btw, the conservative right (churches, hillbilly morons, their elected representatives,...) wouldn't be that successful in limiting the reproductive freedom (in particular access to contraception and abortion and sexed (as education about a specific freedom is the key to advancing of the freedom)) if it were among the basic freedoms.