Yeah, I used to think that too, but when I put it into practice and lost control of my car during a simple every day braking manoeuvre at low speed I snapped back into reality pretty quick.
In fact when that happened the rear slid out so fast it had become unrecoverable by the time I could react and I came really close to sliding out of control into the path of an oncoming car. Not fun at all, my advice from that day on is to NEVER run grippier tyres on the front. Oversteer is laugh when you are hooning and having fun, not so much when you lose control unexpectedly.
So what do those of us with wider rear tyres do?
Die?