Clearly not since members of the public turned him in to the police.

From what to what? Be specific.

Were there people that liked high Healthcare bills that changed their mind?

Was there a way of politicians elected to implement socialized Healthcare that I missed?

The public was already on Luigi Mangione's side in theory.

In practice however he didn't inspire further revolutionary action by the public, because they were pacified by memes. And that's why he's a failure.