I mean, it’s still possible to be fired, it’s just _a lot_ harder. The relationship between employer and employee doesn’t seem nearly as hostile either.
The former is still fairly easy, and just has some process involved, the latter much harder unless gross misconduct can be demonstrated.
It's absolutely true the the UK/EU/etc. have much better rights than the US in this regard, but perhaps the higher pay in the US (at least in tech) pays for that.