Who said poker was easy?

If you open in early position, cbet and still have two opponents in the hand, your top pair isn't the nuts any longer. This is where you need skills to evaluate flop texture, equity vs ranges, table image and your opponents' tendencies.

KQs/KQo/AQo are all very marginal opening hands from UTG/UTG+1. If you don't know how to play them in the situation you described you probably shouldn't open with them and it's not a big problem at all.