Perhaps this will help. I've been mugged at gunpoint. The robber was satisfied with his loot, and did not physically hurt me. He was never caught. He should have spent time in prison for that, and I would be willing to forgive after he'd spent his time.

This isn't that much different from what this bank robber did. He robbed at gunpoint, but didn't physically harm them.

He was 21. People calm down and mellow out as they get older; violent crime is the purview of young people. So I'm not particularly concerned about it - and all of us harbor the potential for violence under the right circumstances. In his position now I'm sure he's well aware of what he'd lose if he robbed banks again, and I seriously doubt a sane person would take such a risk.