My opinion on this must be understood from the perspective of someone who lives in a country where fire weapons are allowed only for military/police, sport shooting (usually are small caliber, you need to be federated participating in competitions to have one, and your storing safe is strictly controlled), hunting (same restrictive conditions) and very special risky conditions/professions like jewelry, but get ready if you end up using yours.
Crime, as in assaults, robbery and such, here is as high as in any other 1st world country--though it could get worse with this crisis--, Yes, you might feel safer carrying a gun, but you're not allowed to. It's that simple. As in any other place, if you really want to, you can get an illegal weapon without a license for a price, but likely just a pistol, not an assault weapon. Further problem is getting the ammunition The bad guys always have weapons to use, the good ones only if they're professionals.
Fortunately we don't have this kind of crimes, perhaps for not having the precedents, or for the difficulties getting a "big" weapon, or could be just cultural, I really don't know. What I know is that to me is quite tranquilizing that if I run into a traffic dispute, or any of those silly situations where you might get involved in violence without not even wanting to, it's extremely unlikely that the guy in front will produce a gun and start shooting me and my family. Problem aren't really the guns but the morons who might get to own and use them. IMHO Controlling that is where the key to prevent these horrible crimes resides. But you have a lot of economical interests and other conditions which make it very hard to implement.
I wish you get to avoid something like this happening ever again.