The reality is that sound bites have an intrinsic advantage over real solutions. Real solutions to complex problems are by their nature complex and uncertain (else the problem would've been solved already).

"Immigrants are the problem" or "I will bring prices down on day one" have a fundamental memetic advantage that, in a lazy and unengaged populace, will win in 100% of scenarios.

The real issue here is the GOP not holding themselves accountable to something better than suicidal demagoguery. The opposing party cannot prevent this from being successful. That's why it's a known, fundamental flaw of democracy.