Earlier quoted context omitted.
It's not an argument you're going to win. Unless you sign up for a managed service that claims to include backups or whatever, you are responsible for your own backups. What's controversial about that?
The issue is that Namecheap was the one that fucked up here, and now is not the time to emphasize "you should really be prepared for us fucking up in this manner". It's victim blaming. It looks shitty. The argument I refer to isn't "you should have offsite backups". The argument is that Namecheap is implicitly victim blaming, and they're not going to convince many people that they aren't.
I mean, if you go for a stroll through the roughest neighborhood in town, unarmed, by yourself, at night, and you get mugged, is it wrong to point out that going for that walk was stupid? Saying so doesn't mean the the mugger isn't guilty or that what happened is right in any sense. It's just acknowledging reality.