Track Etiquette 101. In a race, you pass on the outside. If you have to go around someone you go around them. Track runners have been doing this forever. Yet people seem to equate lapped runners in a race with the recreational walkers who obnoxiously take up lane one when you're trying to do a track workout. It's not even remotely the same thing.
This is a race. The lapped runners are not there for your convenience and they don't owe you a thing. They are trying to run the best race they can. It's true, they're no more important than the runners lapping them. Big deal. The reverse is also true.
In some 10k races, they actually pull people off the track if they're going too slow. That's cool. Especially if the race is being set up as some sort of qualifier. And if the people being lapped WANT to move into the outside lane, good for them.
But they're under no obligation (moral or otherwise) to get out of lane one so no matter how much the leaders may wish otherwise.