Shouldn't I get to decide what I ignore?

Again, ignoring and censoring aren't the same thing.

Part of the reason I come to HN is that I know there are entire classes of content and ideas that I will not be exposed to at all so I don't have to waste brain cycles on sorting them.

Similarly I use a spam filter on my email.

If I wanted to provide a similar experience, targeting a different narrative, and then worked to create my own safe platform, would you disagree with that?

"Ignoring" is just choice. And that concept can either promote or extinguish fair and free communication.

I assume you and I share similar political beliefs. Call it censorship, or call it "choice", it ia clear today not all people have fair and free access.

If the government uses its power to extinguish speech (or to burden channels through unfair promotion of counter ideas), then that is censorship. And that is a problem we should all want to fix.