Is that something that comes from Karl Rove or is this used by basically all politicians.
All politicians.
If you have a soundbyte, you don't have to have a policy. If you have a policy, you don't need an opinion. If you have an opinion, you don't need to have a debate. If you have a debate, your constituents don't need to think for themselves.
So you push a soundbyte so your constituents don't think for themselves.
It all boils down to responsibility and accountability. Politions want the power without the accountability. The less your constituents think, the less they try to make you accountable for being a power-hungry, greedy asshat.