If the rules do not prohibit it, then it's ethical.
Heh. Exactly the opposite of firewall ruleset logic, where anything not expressly permitted is verboten by default.
Sanity? Oh, yeah, I've got all kinds of sanity. In fact, I've developed whole new kinds of sanity. You can just call me "Mister Sanity". Why, I've got so much sanity it's driving me crazy.