[It's late at night, which is exactly what Sentience wanted before making a post like this.]
The Engineers do not take anything seriously. That's simply the way they are; they have a tendency -- not a personal tendency, but a racial tendency, wired into their brain functioning -- to laugh at painful or difficult topics, to treat them lightly.
But even taking cultural differences into account, it is... cruel, isn't it? To take out their boredom on the people here. This is supposed to be a place where criminals can live out their sentences in peace. Everyone here is a person, not... a toy.
[Sentience still seems troubled about the fourth wall.]