[AndrewKemendo]

Fact of the matter is, if the Metropolitan police came to Facebook with the proper paperwork requesting data on a British user as part of a criminal case, Facebook would cooperate with them.

That's because they are British. No, seriously.

Some countries have most favored nation status in diplomatic and economic affairs. As a result, if you piss off the wrong partner nation then you will get stomped on locally.

Brazil doesn't. So the US is not going to force the whatsapp guys to do shit.