I don't think that's a belief.

Beliefs can be wrong, but that doesn't make them non-beliefs.

Any belief of the form "X is Y" (especially where Y is a judgment of goodness or badness) is likely either an instance of the mind projection fallacy, or a simple by-definition tautology.

Again, however, this doesn't make it not-a-belief, it's just a mistaken or poorly-understood belief. (For example, expansion to "I find murder to be icky" trivially fixes the error.)