Because it is a well known fact that it is trivially easy for a resourced attacker to retrieve data from a storage medium well after your computer claims it is deleted.
Not if it is securely wiped multiple times. At that point they'll go looking at your DNS provider and ISP, or local fusion center.
Right, but my browser isn't doing that. Therefore the original point still stands.
> Because it is a well known fact that it is trivially easy for a resourced attacker to retrieve data from a storage medium well after your computer claims it is deleted.
No it isn't. You said nothing about a browser. You said storage medium.