I'd say it is critical mass.
In Europe the Epstein associates are a tiny minority while in the US they occupy many positions of power (in and out of official politics) that allow for stonewalling and mutual support. Plus the tradition in the US not to hold the powerful accountable. So, in Europe it does not undermine the system to go after at least some prominent culprits. There simply is no long row of domino pieces to fall. In the US* Epstein seems to have (deliberately) infected the system itself with a rot so widespread that he probably hoped it would forever protect him. He is gone but the rot remains and fully uncovering - let alone thoroughly removing - it would shake the system to the core, which is why it is unlikely to happen.
*and, so some info I've seen but can't judge the veracity of says, in Israel
I'd say it is critical mass.
In Europe the Epstein associates are a tiny minority while in the US they occupy many positions of power (in and out of official politics) that allow for stonewalling and mutual support. Plus the tradition in the US not to hold the powerful accountable. So, in Europe it does not undermine the system to go after at least some prominent culprits. There simply is no long row of domino pieces to fall. In the US* Epstein seems to have (deliberately) infected the system itself with a rot so widespread that he probably hoped it would forever protect him. He is gone but the rot remains and fully uncovering - let alone thoroughly removing - it would shake the system to the core, which is why it is unlikely to happen.
*and, so some info I've seen but can't judge the veracity of says, in Israel