OK, “won’t be injured” wasn’t exactly true; but they are still in a lot less danger than someone in the same situation on a plane. A train or bus can stop anywhere on its route if there is a dangerous situation, a plane cannot, so in my mind it makes a lot of sense that there are security checks before boarding a plane, but not when boarding a train or bus.
An explosion in the front carriage of a train going 200mph is not going to be good for anyone travelling behind it.
OK, “won’t be injured” wasn’t exactly true; but they are still in a lot less danger than someone in the same situation on a plane. A train or bus can stop anywhere on its route if there is a dangerous situation, a plane cannot, so in my mind it makes a lot of sense that there are security checks before boarding a plane, but not when boarding a train or bus.