> If you really feel you can't operate a business without doing crimes, you shouldn't operate the business.
It isn't Facebook doing crimes, they're a company whose customers are doing crimes.
> The problem, to me, is that everything you said applies down stream too. You can't be sure the person purchasing the ad is trying to commit a crime either (perhaps they were hacked, perhaps they were dumb, etc).
Which is why we have investigators and courts, to sort this out. When the police execute the warrant and find the drugs, the person's claim that they were hacked is not going to hold a lot of water. Whereas if they find no drugs but seize the computer and find malware on it, then they can investigate the malware network and find the actual perpetrators.
This is law enforcement's job. To figure out who actually did the crime and charge them with it. Facebook can't do that and shouldn't be expected to.
> So you get into this situation where Facebook (and everyone else at that scale) can do some crimes, but not so many that it's a big part of their business. It seems bad.
Why is it bad? Why is it even expected to be bad? It's true of every business whatsoever. A major hardware store that sells duct tape will have as customers some number of kidnappers who use it to tape the mouths of their victims. The kidnappers will go to a gas station and buy gas. These companies are thereby profiting in some small way from crime. But so what? Go arrest the kidnappers, the hardware store is irrelevant.