In most countries you don't need to be armed to kick people off a bus. Do you suggest people throw out drunks at gunpoint? That seems really dangerous.

If one person is armed and the other isn't, the fight's over before it begins unless the other person is disabled by drugs or mental illness. If neither is armed, a surprising number of people will think they have a chance against the trained fighter, and some even might.

Therefore, arming conductors helps even when nobody walks around with a firearm.

It helps if you want to increase the number of people killed for being stupid on a bus. I don't think the penalty for disturbing public order should be death.

To the helpless, I suggest don't poke the bear.

I would be shocked and refuse to work at a place that allowed employees to bring in guns.