Again, because you recognize what you did was wrong while being able to identify other people's wrongdoings without putting it all on yourself.
It shows you're being genuine, you know you f**ked up and actually feel that way without trying to milk sympathy, and also shows you aren't trying to make yourself the sole victim to, again, get as much sympathy from others
Pretty easy way to tell when people just want attention- they portray something as 100% their fault or themselves as 100% the victim. You're being neither and can actually recognize you're a mix of both (like literally everybody is, just to varying degrees) which shows to me you're more than just asking for half-hearted sympathy