The vulnerability of every account doesn't depend on the people behind them - it depends on the site itself...
It very much depend on the people behind the account and their behaviour.
Is bitcointalk that vulnerable?
Not really, as we didn't have too many hack cases, at least not among the higher rank accounts. That of course doesn't mean that it coulnd't be safer by implementing 2FA as thatr's something that many of us would like to see happening sooner than later.