I'm not sure I'm fully understanding what you mean by "valid" here, because there's lots of emotions that seem obviously wrong and controllable.

The most obvious example is a fear of public speaking. Everyone I know who's struggled with it (including myself) has resolved it through the perspective that it's wrong to be afraid and you've gotta figure out tricks to get over your irrational fear. It's hard to see what a more "validating" approach would look like.