Why does Bruce want to get involved with this guy?
Probably because Oliver Stone was willing to meet his price.
To show his peers in La La Land how conservative he really isn't. Bruce catches a ton a heat for being a Republican and it weighs on him. That's why he backed out of introducing GWB at the GOP convention in 2000. He no-showed at the last minute.
Willis is a good guy... but not exactly a tower of strength.