Say it in a bar with your friends if you wanna make a stance or a joke, avoid global social networks.
Maybe UK is simply showing its true face, but exposing in public your ingenuity has never ended well.
There's a reason why McDonalds writes "Caution: Contents Hot" on their hot beverages.
Long story short: if you know sth can happen, you should try to prevent it, or you'll be considered part of the problem, even if only partially, the consequences could be bad.
EDIT: as explained here[1], the true story is a story of underestimating the risks.
Free speech on social private networks is not the same thing as free speech in person and it's absolutely not risk free.
People know that, but keep thinking "it won't happen to me" despite the fact TOS say very clearly what can and cannot be said and that a big "report" button is there for anyone to use.
nobody has ever been arrested for saying horrible things at the pub with their friends. Nobody would have ever said the same things on national TV. But suddenly we started thinking social networks are like the pub while they are more ubiquitous than the TV.