Well lets see whats more important:
Job as pizza delivery guy, my life, Job as pizza delivery guy, my life, Job as pizza delivery guy, my life, Job as pizza delivery guy, my life, Job as pizza delivery guy, my life,hmmmm. I think I will go with my life!
Tell him to get his CCW & some decent training, and a Glock. Carry concealed, it's easy but it will take him some time to get used to it. I carry my big Sig P220 all day everywhere permitted by law, I visit my relatives, hug, go to church etc. No one has ever noticed. Your dad can do the same. So what! if he has to draw a gun to save his ass, he may be unemployeed but he's alive and you still have a dad. I know folks, ER doctors, EMT's, and others where they have a great deal to risk if they get caught as a result of carrying but they do anyway. In the end, you'll survive loosing your job, but DEAD is DEAD!