I tried to separate recent crime statistics from the rest of the paper. Turns out there weren't many: the level [of lethal violence] in 2015 – when a total of 112 cases of lethal violence were reported – was higher than for many years. lethal violence using firearms has increased within the context of criminal conflicts. The number of confirmed or suspected shootings was 20 per cent higher in 2014 than in 2006. The s…
And if the statistics are done like in France, they aren't even allowed to note which religion the suspect has, so some simple statistics that would give such a relation are by definition not possible to make.
On one side, it's true, the free society is not supposed to look in the people's heads. On another side, if the perpetrators explicitly tell you why they do what they do, it's really, really wrong discarding that information.
The policies that disallow the access to the non-biased facts are serious limitation in more than one land. As an example in the US, there's this 2001 "Guideline" for the "professional journalists":