A tragic case from beginning to end
I am pretty confident that neither mixed martial arts (MMA, cage fighting) nor Islam has anything to do with this awful and tragic case from London, UK. I am also pretty confident it has a lot to do with mental and/or drug related issues.
When you have a suspect that evidently has been overheard shouting "The cats have stolen my lighter" as he hacked a poor cat to pieces with the edged weapon, it seems pretty obvious we are dealing with a very disturbed individual.
Other reports claim the suspect had ambitions to become a cage fighter, but that he had gone off the rails and was known locally for dealing drugs.