This is mainly because nothing really needs excusing.
Everyone has reasons for what they do - conscious or not.
Once they have decided and acted the action is taken - nothing can 'excuse' it, but it is possible to recognize the reasons.
Btw, I don't like absolutes, but I find them useful to explore concepts sometimes... ;-)
I love ObiWan Kenobi's ironic statement, "Only a Sith deals in absolutes." Uh, isn't that an absolute statement? May the farce be with you!