People sometimes say that we lack remorse or guilt like it's a bad thing.

Ummm.... it is a bad thing. It means you don't acknowledge something you did wrong.

Yes, because it is. Anyone saying that wants to express a distaste for lack of remorse or accountability.

You know who lacked remorse? Germany in the 1930's and 40's. I think Stalin, Pinochet, Mao Zedong and Idi Amin all thought remorse and accountability were negative qualities.