Earlier quoted context omitted.
Try asserting any right to silence at the US border — you won't get far. If you are not a US national, I'd expect you to be refused entry (and as one is required to complete an ETSA prior to arrival, one is required to sign away any right to appeal of the decision of the border control staff).
Oh, I'm totally fine with people who are non-cooperative and non-citizens being denied entry. I'm a US Citizen, so I have an absolute right to re-enter the US without answering any questions (they do have a right to make sure I'm who I say I am, and that I'm not carrying any prohibited things in contravention of customs regulations, but that's it). I'm not sure how it works for transit. Also, if I were not a US citiz…
The Heathrow airport is quite a mess, actually.