> You don’t think leveraging your site to DDOS someone is a problem?

It is, but it's one of the only tools they have to prevent the doxxing site to being reachable.

> Do people not also deserve to be protected from being DDOSed?

You mean the person doing the doing should be protected ?

>Do people also not deserve to not have their internet traffic be used to DDOS someone?

Yes, it should have been opt-in. But unless you doesn't run JS, you kinda give right to the website you visit to run arbitrary code anyway.