Mostly because it is illegal to kill them.
For now.
People who are obviously mentally ill shouldn’t be executed...the Nazis did that back in the 30’s and 40’s. What he SHOULD have happen to him is incarceration for such a blatantly obvious rip-off of taxpayer funds. Not only him, but every lawyer, doctor, and government worker who authorized this travesty needs to be locked up.
Now, if this dude also shows a predelection for perversion against children...THEN you can execute him.
I can dream can’t I?