Yes, but no. "X is not acting in accordance with X's stated values" is a perfectly valid statement, for all values of X. "It would help problem Y if X did act in accordance with their stated values" is also a valid statement. What's not valid is to act all surprised that X does not in fact act in accordance with their stated values - especially where politics is involved. (It's still valid to point out that it's happening.)

Politicians dissemble, lie, act hypocritically, mislead voters, and... did I leave anything out? If you want to change their actual behavior, you have to change their incentives. One way to do that is to get the voters to hold their feet to the fire, to get them to act consistently with the values that the voters elected them to embody. (Which gets us back to "X is acting inconsistently..." being a perfectly valid thing to say.)

But the problem can run deeper than that. The voters themselves may mouth certain values, but actually desire things inconsistent with those values. At that point, the politicians are embodying the desires of the voters; the problem is the voters' hypocrisy. Once again, though, pointing out the hypocrisy is about the only way to try to attack the problem. (Changing the voters' incentives would almost always require the voters' acquiescence...)