How can we get grown-up leaders?

BBC NEWS | UK | London attackers 'meant to kill'

London is attacked again, though in a rather odd fashion. (Was the attack sabotaged?)

Ken Livingstone, mayor of London, basically says (via NPR) that there are really no magical solutions and that everyone will have to make do. Things will be done, but they will not fix the problems. Promising technical solutions (explosive sniffers) are still years away.

If an American politician said such things they'd be tarred, feathered, and fired.

I suppose to get grown-up leaders, we'd first have to grow-up ourselves.