BTC-e was perhaps "safe" in that it seemed to be operated competently from a technical standpoint, and it didn't appear to attempt to scam its users (both of which may not be true of Mt. Gox), but it didn't really need to worry about costs due to the absurd amount of profit they were making from their laundering hustle.
It wasn't that they merely turned a blind eye to the laundering. Vinnik personally assisted in the laundering, presumably by working with some of the exchange hackers.
>BTC-e was around longer than those exchanges.
I should've said "a cover to help criminals launder illicitly gained cryptocurrency". There were plenty of reasons to launder cryptocurrency before any large exchanges existed. He didn't help just with exchange hacks. But when exchange hacks started happening, business was certainly booming for him, since that was the easiest way to steal a lot of cryptocurrency at once.
The US government may have inadvertently stolen your money, and other people's, but they did it to reappropriate billions of dollars money stolen from citizens around the world, including American citizens. Vinnik helped intentionally steal money from ordinary people who used Mt. Gox and other exchanges, and pocketed a lot of it for himself. Hopefully some of the money the US government seized will be returned to their rightful owners one day, but who knows.