I destroyed all evidence of guilt
Did you destroy the evidence of your guilt because you only care about yourself and not justice?
Yes, I only care about myself.
You shouldn't destroy evidence if it points to who the real suspect is. You might be trying to protect yourself but if someone was wronged, they deserve justice. If they don't get justice, then people will feel wronged and angry.
I don't care if I got caught, I wasn't the one who did it.
If you didn't care about getting caught you would have no reason to destroy evidence. That evidence could have brought someone to justice. Destroying inhibits people from getting closure and may live the rest of their lives always wondering who the guilty person was.