If it was covered up back then, it can be covered up now.

Right. But Rolf Harris went to Jail. So the structure that kept him safe dissolved at some point.

So it's less likely to be covered up now. And the "me too" movement has opened as space where victims can speak out where in the past that with less personal scandal and more hope of action.

We've confirmed that government factions are capable of this (Dutroux, Epstein, Thatcher)

Dutrous and Epstein weren't government. Thatcher wasn't involved in sex trafficking of minors.

A lot of atrocities are also revealed after the fact (20-50 years later) when the perpetrators are gone.

Dutrous is in prison in solitary confinement. Epstein died awaiting trial. Thatcher is dead, but no atrocities are linked to her have arisen. Saville was certainly investigated only after his death, which would happen if he had significant influence over the investigations. If that's the case the Harris was protected by Saville, as he was convicted and sentenced.

I can't see any link between those people and the current day.