Yes, the difference between a good idea and a bad idea often reduces to a matter of degree. A ten-mile wall (or whatever) might be a good idea when a 2,000-mile wall is a batshit stupid idea. Or, a ten-mile wall that's commensurate with the problem at hand might be a good idea. In order for a 2,000-mile wall to be a good idea, there had better be a horde of conquerors on the other side who are mysteriously powerful despite lacking modern wall-breaching (or flying) capabilities. Last time I checked there is no such horde of conquerors except in the imaginations of Trump-supporting mouthbreathers.
I don't know anything about these Clinton walls that you've latched onto in your desperate attempt to say something clever. Maybe they were effective, maybe they weren't. I have no idea. But I do know that Trump's non-plan to build a 2,000-mile wall is fucking stupid. The mere fact that these Clinton walls were apparently actually constructed whereas we all know nobody's going to build a wall across the entire U.S. - Mexico border is indicator enough of just how stupid Trump's rhetoric is.
Now stop wasting my time.
I enjoy how you tell me you don't know anything about the topic yet are convinced I'm saying nothing of merit. I will grant you that as I'm an idiot you are probably correct there.
Btw, horde of conquerors? Not this generation but the Reconquista is most certainly occurring. I'm not saying whether this is a good thing or a bad thing but to deny it's happening is silly.