Whichever country they occur in, mass killings and school shootings chill us all to the bone.
Although limited to US evidence, and still subject to review, I urge you to read this paper at PLoS ONE. To quote from its abstract:
On average, mass killings involving firearms occur approximately every two weeks in the US, while school shootings occur on average monthly. We find that state prevalence of firearm ownership is significantly associated with the state incidence of mass killings with firearms, school shootings, and mass shootings.
Please let’s do something effective to reduce those commonplace slaughters, rather than continuing empty rhetoric. This is not a debating point but a matter of life and death of our children and our friends.