[inigyou]

So if something is illegal you don't think it's moral to enforce that people don't do it because just being illegal should be enough?

Note there's no liability on the ISPs, they do not have to pay a fine for not having blocked it, they do not have to ban alternative DNS. In Europe there is apparently a legal mindset that you can recruit a third party to conduct an action that is not onerous to enforce a blockade. A court can point to someone who has a DNS server and order them to block certain lookups.