What you describe is the principle of presumption of innocence. Shame it seems to be a lost concept in the land of the free nowadays.

I feel it goes a bit beyond that, because at this point it's also the presumption that those governments are operating recklessly and with knowing dishonestly.

You could argue that presuming you're an alien implies that rights given by law don't necessarily apply to you. It's far worse than being presumed guilty.

This is why due process is so important, and why it's terrifying that it's being hand-waved away.

If you had a problem with Bush & Obama suspending habeas corpus, this should be setting off alarm bells for you if, for whatever reason, recent events haven't.