It's a bit difficult to 'address the problem' when the perpetrators are not easy to pin down in any one country. This bomber was (according to latest reports) a Libyan. But there have been terrorist attacks by Brits (Lee Rigby for example was hacked to pieces by black British fundamentalists) One never knows when, where or how they will strike. That's the very nature of terrorism.

I'm a bit concerned for my husband to be honest. The very word 'Muslim' dare hardly speak its name. He starts Ramadan next weekend. I so hope people won't treat him unkindly because of this event in Manchester.
The Internet is full of vituperative invective against any and all Muslims.
I have fond memories of Tripoli. The Libyans I met there were delightful. One can't tar everyone with the same brush.