There are a few grumbles online about David Cameron and Teresa May hotfooting it to Cumbria to meet victims and emergency services who dealt with the terrible tragedy there.

But I think the visit is both understandable and right. Yes, some police resources will have to be diverted to look after them, but not much. And yes, there is not that much that the Prime Minister can actually do. As he said yesterday, this may just be a dreadful one-off case of one indivdual snapping, from which no broader lessons can be learned. But it was still right to go.

Sometimes, as with visits to regions hit by floods, it is possible that a visiting Prime Minister will learn things which lead to resources being allocated differently, or a different tack being taken. Sometimes, as when TB met the victims of the Omagh bombing with Bill Clinton, such encounters merely serve to fulfil a broader political purpose, namely the expression of a determination not to be knocked off course by those seeking to disrupt a peace process.

And sometimes it is just the right thing to do for leaders to visit a community that has been shocked by tragedy.

I can remember when the Dunblane massacre took place, and both Scottish Secretary Michael Forsyth and Labour shadow George Robertson pressed for then PM John Major and Tony Blair to visit the next day. Major was very wary, but the two Scots politicians persuaded him it was what the commuinity needed and wanted. And that is how it felt the next day.

They had nothing to offer but expressions of support. But those expressions of support meant something.

I would count the visit to the scene of the massacre, a primary school, as one of the most upsetting and moving experiences of my life. I know that Tony Blair felt the same, and I could see that John Major did too. There really were no words to sum it up, but both of them had to find them as they talked to doctors, nurses, paramedics, teachers, and of course parents who had lost children.

I don’t doubt that David Cameron will be moved and upset by what he sees today. But the community, whatever the grumbles from some, will feel a little better than the Prime Minister took time out to pay his respects.