You're confusing concern about prison suicide in general and this example specifically with skepticism that he committed suicide or that someone helped it happen in some way. They're not the same thing and one doesn't lead to the other.
There is no evidence whatsoever to suggest this was done to him or intentionally allowed or made to happen. Furthermore the prison system makes it very, very clear that no such intervention by anyone is required to give us this result. It's not rare.
No I'm not confusing anything.
the conspiracy, if there is one, would be someone who wants him dead, and knows he would do it himself given the opportunity, ensuring that such an opportunity presents itself.
The thing about conspiracy is that conspirators go to great lengths to suppress any evidence and to leave as little evidence as possible. So the lack of available evidence doesn't mean investigators shouldn't go looking for it - and that doesn't happen without a healthy amount of skepticism.