Not any chance in the world that someone this well-known, on watch, who had previously tried it, was able to do this without help. Whether it was forced or he was directed to do it while guards looked the other way is the only question, and who ordered it.
As for any finger pointing, bucketloads of people both red and blue (including both Trump and Clinton) had been tagged as being involved with him and are glad he's dead. Clinton's aren't even in office, so I'd be more inclined to look at people currently in power. But regardless this doesn't not happen to someone on suicide watch or this high-profile, much less both, unless very powerful people wanted it to. Think of all of the high-profile terrorists in custody that haven't been able to, but Epstein is able to do not one but 2 attempts, successful the second time.
No proof to support this scenario, but my gut feeling is that this went down something like this. In his first suicide attempt some men in black show up in the middle of the night, choke him near death, and tell him to keep his mouth shut over any of the hideous stuff he's done with powerful people, and that is passed off as his 1st suicide attempt. I'm still not convinced the Manhattan power outage also wasn't an incredibly strong warning, the timing was strange. Fast forward, more and more evidence leaks daily, and the men in black show up in the middle of the night again, guards are paid or scared into looking the other way, and they tell Epstein it's gotten too hot and it's time now you to hang yourself (or they just strangle him and rig him up). It'll make a good movie someday.