Trump showed his concern for the victims of the London terror attack by ignoring the victims. Instead he chose to take advantage of the terror attack by pushing his own agenda with his Twitter account. This is the way in which he conducts foreign policy. He can ignore intelligence briefs and avoid reading briefs from his advisors. Its all about where he is at any moment in time. It was not very popular in the UK. Prime Minister May and others turned their noses up after reading tweets.