Or a second-hand computer: I do not wish to carry previous owner's use history into my usage, and neither should anyone else. Do not conflate "unusual" with "therefore hiding stuff", and don't even try "hiding stuff, therefore bad".
There are legitimate reasons for wiping data...can't believe we're having this discussion, here of all places.
I agree there are legitimate reasons for doing so. None of which will matter to some official busybody rummaging through your drive. To them, a drive filled with random noise (instead of, say, being zeroed out) is going to be unusual in a way that correlates with bigger things they worry about. Or, in short, suspicious.
In no way am I arguing that you shouldn't wipe your data, use encrypted filesystems, or anything like that. That is a totally legitimate thing to do.
We're just talking about drawing attention to yourself from governmental agencies that probably don't have your well-being as their highest concern.
Using state-of-the-art encryption to keep your files safe is good. But if it leaves any evidence that you are indeed using encryption, you are potentially drawing attention to yourself. And people should be aware of that.
There are legitimate reasons for wiping data...can't believe we're having this discussion, here of all places.