The OP mentioned the pilot and passengers had elevated carbon monoxide in their
blood. If it was of a significant concentration, there may be some "actionable"
issues related to the aircraft's condition. Too much HbCO would likely accect
judgement, although the OP also suggested the pilot had documented poor
judgement anyhow.

With respect to thunderstorms in FL, I have a distinct memory of overnighting
in Miami one Feb because there was a solid and continuing line of the things
crossing the middle of the state, and it was more than I wished to subject me
or my Mooney to.

I don't know how often that condition exists, but the radar pictures I was
seeing while flight planning made me change my plans.