Definitely in line with your statement, I ran a forum for years. At one point I found an iptables script that blocked all known Tor endpoints. What happened was, trolls posting gore and porn to a child oriented forum (which had persisted for 2-3 years) immediately and totally stopped. People in these threads point out that "criminals can use a VPN", but in practice it never happened to us. I never once heard from anyone that a legitimate user was impacted.