Ignorance vs. Guilt

I think that if you don't know that it is a crime you should still get blamed because you did it. ignorance is not an excuse.
I think that he did the right thing by banishing himself because it shows that he is true to his word. he killed the king and just because he didn't know that it was is no excuse.
in a modern day trial you would still get punished even if you didn't know that it was wronge so i think that he desirved to get punished.