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Because the substance of the promise is terrifying.

One example is the ACA/Obamacare. Trump has sent very conflicting messages about repealing it but keeping some of the more popular parts.

I think many people are concerned by Trump precisely because he has been so slippery on many issues and has the unique ability of being able to stand for and against something at the same time.

>...he has been so slippery on many issues and... stand for and against something at the same time.

Because ObamaCare is not 100 percent all bad or 100 percent all good.

Trump, like everyone, is allow to like the good part of ObamaCare and hate the bad part of it.

If I promise to shoot you in the head, does it make sense for you to criticize me for not following through?

If you promise to kick me in the groin, I'm going to be pretty happy if you don't follow through.