Re: Automatic bricking...
You'd be well and truly shafted if there's a power failure or your system crashes etc. etc. You'd be taking a huge risk with your data.
I had a basic script setup in my less-than-legitimate-youth that wiped out the disk, firstly by destroying the superblocks followed by a full write of random data. Thankfully I grew up before I got into any serious trouble.
Either way this will help you little, destroying evidence is still perverting the course of justice, just the same as refusing to give up passwords.