From what I know Vitalik wants to go PoS, but Gavin Wood et al refuse to do anything other than PoW.
Interesting and plausible. Gavin is a wise man if so.
So earlier, that Buterin had thoroughly studied the vulnerabilities and found PoS wanting made it clear to you that PoS had insufficient security.
Now, when you find out that Buterin has decided that PoS is the best option (but is dissuaded by others from using it), Buterin is clearly wrong despite his thorough study.
So there are probably no arguments or studies or science that could persuade you that PoS is secure, right?