Why I am being accused of trying to defend what the man did?

His actions are indefensible and anyone who assisted him knowing his mental state should be prosecuted as an accomplice.

If there are many more Americans who have the same delusions then they should be locked away for their own safety and that of the general public.

Telling me I am trying to excuse what he did on the basis of insanity does rather call into question the intelligence behind such an accusation.