[bhaak]

That doesn't help you much if you're starting out. You have to trust somebody and someone has to point you to something.

If it's a specific browser extension or a web page that you can run after you've cut the internet doesn't really make a difference. Note that vanity-eth.tk points out that you don't have to trust them and how to ensure that the private key stays private. But that needs some knowledge and that's certainly not for everybody.