"If the goal of the library is to be used in closed source, you will be limited to reusing code to only those that has compatible license with the closed source. That is a choice you make that has nothing to do with writing software to fix problems that people have in their lives."

It absolutely does. It fixes problem of people who work on close source or otherwise something incompatible is gpl. You either dont count them as people or as problems and neither makes sense. I used open source inside closed source. So yep, if I am going to five away, I will give to the same pool. Generous people gave me something, so I am giving back.

A library that I can not use does not solve any problem. That is not pragmatic, just something with limited use. Which is fine, if you feel strongly about your work use being restricted to some people only. I don't.

The moment when your logic twists gpl into literally "the only pragmatic license" is the moment when I wonder whether you are even honest in your arguments.