> Anyone can relatively easily become a domain registrar.

Relatively easily? It isn't exactly a cheap venture: e.g. $4k+ per year to become an ICANN registrar.

I think people shouldn't have to pay that much to exercise their free speech.

> It seems strange that someone would expect a registrar to defend them for the couple of dollars per year you generally pay.

I think that unless a registrar is legally compelled to unregister your domain name, they shouldn't take it upon themselves to unregister your domain name just because other people are offended by what you put on the web server that your domain name resolves to.