I think you may be overly hung-up on the wording (not that the wording isn't important; another reply to my comment suggested a wording I like better); I'm trying to engage the statement with the sentiment I believe it is trying to convey, which I think is different from the sentiment in the statement "ignorance is bliss" and is more of a sentiment against pedantry.
The problem is that the issue is phrased too crudely.
I don't want to be ignorantly happy and wrong. My definition of being right implies me being happy or at least at peace with myself.
It may mean disengaging with a pointless discussion, letting somebody wrong have the final say, etc. Because that means I'd made a "right" decision.
The false dichotomy is really unnecessary.