It is. You haven't argued it at all, right here. You just asserted it as if it were self-evident, talked about your feelings, then demanded policy.
Your only job here was to convince people to align with you, and you didn't bother. It makes me suspect that you haven't really solidified the argument in your own mind.
I could guess at arguments but the ones that come to mind are pretty weak. For copyrightability, if half the lines in a FLOSS project are public domain, the license will still be effective. For infringement when training, that's not really the user's problem. For LLMs being proprietary, that doesn't infect the output, also many LLMs are not proprietary. For danger, there's not a lot of that specifically in the code-making context, and I don't see how danger makes something anti-FLOSS either.