As a society, the USA has decided that mere pragmatism is insufficient for restricting speech or the closing down of platforms. It would be much simpler if we could make case-by-case decisions based on cost-benefit or risk-reward, but we don't.

I know that people wish to just cut the head off the snake, but our norms caution against that and our laws prevent governments from doing it.

Well, I don't live in the USA. Free speech purism is a US-specific sociocultural product that most people don't subscribe to.

Even then, I'd say that the USA has decided no such thing. What you're talking about is a modern civic religion and ideology that some but not all Usonians subscribe to. But the creation of law in the US has always been a pragmatic exercise. The electoral college was a highly imperfect pragmatic compromise. Exceptions to 1A were pragmatic lines being drawn. There's no God-given reason why defamation should be illegal but bullying to the point of suicide should be legal. Roe v Wade was pragmatic line drawing at the point of fetal viability. Look at how many pragmatic compromises are behind the inflation reduction act.