No idea why he needed to be executed
Take away his money, put him in jail for some years/decades and ban him from working any job title that high up the ladder for the rest of his life
And we letting it be known anyone talking to you is open for potential investigation for crime syndicate activities make that shyt look like the horror version of the Truman show
At least if you keep him alive you have an example of the punishment for people to see and be reminded of
Now that he's dead he will be forgotten over time along with the message
Because prison doesnt scare people enough obviously. A random execution im sure has more influence. Because you never know if it could be you.