I can say I'm sorry OK when it's something simple -- bumping into someone unintentionally for instance.

And psychologically, if it's something kind of simple and I either realize it myself on my own or realize it from something the other person said, then it's no big deal to honestly say I'm sorry.

If I'm in a narcissistic or otherwise defensive mood, though, then -- well, no I'm not exactly sorry sometimes. Even if somebody else thinks I should be.