I'd rather that happen then have EVERYONE you beat back just destroy their bases when they think they've lost. It's annoying and immature to throw a fit and destroy everything when you lose-though I did do it when I started-but now at least you know you'll get something out of pushing them back instead of just the self pat on the back.
Scouting > Any Rush. If you aren't rushing, prepare for the rush-its that simple.