If the UK was only arresting people for posting death threats, you might have a point.

That’s not what’s happening, and not the kind of speech suppression that people are worried about.

Some of it is less extreme, but there’s no suppression of normal critique of policy.

"normal" as defined by those in power over policy.

As defined by the social contract :)

Seems to me like you’re quibbling, because you can’t defend your claim by showing a single example.