The numbers are out there for anyone to form an opinion.
Although you can count more strictly only the cases where it is clear the infected person did have sufficient adherence/drug levels in the relevant body tissues (there are 2 or 3 cases like this) or you can count also the cases where the person _claims_ to have been adhering perfectly to PrEP, but it's has not been clinically confirmed (I think there are just under 20 cases like that, which include the previously mentioned ones), if you put these numbers in relation to around 1 million people using PrEP over a period of more than 10 years, at least to me it's pretty clear that the risk is miniscule, not to say neglectable.
A million people using PrEP for over ten years and at most 2 per year ending up with what is a perfectly treatable condition. I can live with that. If you can't that's really up to you. But comparing the above statistics with Russian Roulette is simply ridiculous as that roulette entails a one in six chance of dying on the spot. I am confident most readers of this post will understand the difference.