> Most legal systems have concepts of being an accomplice, criminal negligence, constructive possession and so on. So it seems reasonable that a website which help crimes be committed or hosts illegal content on its servers should have some liability or requirements on taking reasonable preventive measures.
That doesn't follow at all. If you get on a Greyhound bus with the intent to get to a place to commit a sex crime, Greyhound would "help crimes be committed" by carrying you to your destination, but they're not the police and it's not their job to investigate you before allowing you to travel.
> Especially if the website is made aware that such crimes are being committed.
There are two different versions of "made aware" here.
One is that a court has decided that something is illegal and ordered them to take it down. I have a hard time believing that they don't comply with that.
Two is that somebody claims that something is illegal, but the website is neither judge nor jury and has no competence to adjudicate the claim. In this case it's not at all unreasonable to refer you to the actual court system, which will bring you back to number one.
The fact is that all of these alternatives are designed to be an end run around the constitutional protection of speech, by foisting the messy process of determining what's illegal onto a platform that can claim it isn't subject to the First Amendment, instead of a government body that is. Even though it's a government penalty being imposed for not removing what is, in practice, a body of works some of which are lawful speech.