I think the government making stuff up is worth considering, but isn't it a kind of different threat model?

The hypothetical government isn't going to make stuff up about me, some nobody, on a flight to the US to be a tourist or something. They statistically don't care about me. However, the US morality police might decide to statistically care about everyone who watches porn.

But if I'm a somebody, say a former or potential whistleblower, or a local politician, etc. then a government might have a specific motive to do me dirty and not care about being honest.

I guess there's a wide and blurry line between being a "nobody" the government has no motivation to lie about and being a "somebody" that deserves special malicious treatment.

The moral outrage crowd in the US have no power. The people who can and will act against you will only use morality as an excuse, not a cause. Being some nobody, the government has no interest in you anyway. You can watch porn, they can know it, and nothing changes, because you're still a nobody.

(If you watch porn online, you can be pretty sure they already "know" it, because you're not doing it in the privacy of your own home, you're doing it on a public network with next to no secrecy about who you are or what you're doing).