Making an appeal to the authority of the behavior of deontologists isn't persuasive. Most dietitians eat pizza. Pointing that out isn't evidence that pizza is health food.

Comprehensive theories that cannot be comprehensively articulated are not comprehensive theories. I.E. it is a real problem that we cannot say whyfor it is moral to drive to work with a risk of killing someone's at 0.0000001% and immoral at 5%.