The attack in London

There's a message here somewhere, but I'm not certain what it is:

http://www.itv.com/news/2013-05-23/two-men-arrested-after-man-killed-in-london-terror-attack-woolwich/

This second version shows one of the attackers:

http://www.aljazeera.com/news/europe/2013/05/2013522171012368683.html

Nothing about this makes any sense to me. There is no problem for which violence is the solution; not terrorist violence, not government violence.