Now is not the time to hide, your fans are waiting in line all over Europe to see you. And see you they will. Your new # one fan, the Queen, thinks you are a very good singer and if you ever expect to be knighted, you better get back up on the stage and perform.
Think of the kids that didn't make it the other night, do it for them, they would certainly want the show to go on. Don't blame yourself, the fanatics are out to get everybody.
As for the kids of the UK, they are a tough lot like their parents, they are resilient and don't cower in the face of danger. Look at the kids at the hospital when the Queen showed up to see them. Pay them a visit, make their day.
If you need a reminder of why you are doing it, take a look at this photo of Ann Margaret performing at a Bob Hope USO show during the VietNam War.