You seem, at least, to be implying that it is a mistake to back the one candidate, in either party, to whom there are no sacred (politically correct) cows that are above challenge or criticism. The implication being that it is dangerous to rock the boat that is racing towards our destruction. Let me suggest that there is no way--none whatsoever--that you can actually justify your cliff metaphor under the relevant context to what we are discussing.
Donald Trump is a natural Conservative (see Metaphor For American Conservatism). He is now increasingly focused on how & why we have gone astray from our heritage in recent decades. That is not a path towards falling off a cliff; it is, rather, the safest way to avoid such a fate. Indeed, perhaps the last clear chance that we have to avoid such a fate.
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