[The chance had always been slim that they would have gotten any useful information here. Still, they had done their best.]

There is always that.

[He's not sure whether or not it would be worthwhile but he was quite sure it would be the right thing to do. Letting things be as they were seemed... callous.]

It would be the respectful thing to do. Leaving the graves open and uncovered seems a disrespectful thing to me, to the dead as well as the living people who comes to visit those resting here. We can't do much else for them at this time, might as well do the one thing we're able to offer at the moment.