Politicians should face voters' wrath for changing position because when he or she changes sides on an issue, it demonstrates that he or she may change position on other issues in the future, so voters rightly lose trust in the politician. When voters feel like a candidate may no longer represent their best interests, the politician may face wrath such as anger or loss of support.
Clinton doesn't seem to understand that she's doing everything she possibly can to play into Trump's hands. Being the definitive establishment politician and flip-flopping on NAFTA, the TPP, gay marriage and more can only lose her voters, and Trump can only gain them. Politicians will face the wrath of voters, but at the worst possible time.
Yes, politicians should be confronted about changing positions because it shows whether they are trustworthy or not. This is an issue every politician has. Every politician flip flops, but it's how they change positions. Some politicians say they are against something that they were in favor of before, then act as if they held that position the whole time. Voters should go after the politicians who do that sort of thing.
Donald Trump has pointed out several policy position changes by Hillary Clinton when it comes to support for free trade agreements. Clinton will likely face the wrath of some voters for changing her positions on many key issues. Candidates should be held accountable for changing their mind on important key issues. Therefore, when politicians change their positions, many times, they will face the wrath of voters.