The concert will help the community come together, that's a good point. The fact is that the threat of another attack is still imminent and singing kumbaya like Whoville on Christmas morning is high in symbolism but when will enough actually be enough.  Je suis Charlie and world landmarks lighting up in solidarity with the nations affected by terrorism are symbolic but when these rituals become routine - on a monthly or even weekly basis, we should have the "uncomfortable" discussions about reality. The reality is that there are 20,000 people in the UK who sympathize with ISIS and like-minded groups. The reality is that the latest attacks in London were perpetrated by extremists known to security services. It is encouraging to see people getting out and doing the things they normally do but we should also address the issues staring everyone in the face on a daily basis (radical imams, radical mosques, cultural segregation). It's not like the extremists are hiding.