I hate to be all doom and gloom but if the government decided tomorrow that disagreeing with trump was a crime then it’s probably already too late for you.
The amount of information about people online is pretty shocking and no amount of cleaning up after yourself could save you at this point.
On the other hand, it probably won’t devolve that fast so you’re probably ok?
My completely unqualified position is that manjaro is not more stable than arch, in fact, according to the news manjaro’s changes are just more instability. I’ve been running basic arch & KDE for 6 months now and it hasn’t been perfect. The biggest issue I’ve had so far is; “using the scroll wheel in the KDE start menu will crash the DE” and that was fixed in a day.