When he is arrested, he will turn towards the camera and smirk.
He knows that he killed and maimed millions - and you can only kill him once.
It will be hard for many people to get any 'satisfaction' from that.
UNLESS you understand that his pain will be infinite and it will last an eternity, while many of those that he killed only suffered a short time and are now living in paradise.
A faith-based mindset might be the only way to stomach the arrests....
Or, the simple realization that the millions that he could have killed in the future are now safe.
It might be useful to mentally prepare yourself before it happens.
Like he did with the beagles; head in a box with bugs eating him out, but before, you also do what he did with OTHER beagles; head in a box, smoking cigarettes until death.