no significant mortality risk to Europeans.
This is "Whataboutism".The rational behind being wary about terrorism is as follows.
1. Normal homicides are random individual actions, and they are under reasonable control by standard policing. In other words, if we continue policing as we do now, normal homicide rate will remain constant.
2. Terrorism is not random individual action, but rather organised violence by large groups seeking power. If we continue policing as we do now, terrorism will increase, up to a point where the terrorists take over and are the new rulers.
(Compare for example with the reaction to the AIDS epidemics in the early 1980s. The lazy whatabout-ist could have said (and indeed did say): "Oh AIDS just affects a few gays and needle-sharing heroin addicts, whatabout the orders of magnitude more who die of the flu and cancer, no need to worry about AIDS".)
If you believe the two 'axioms' above, then it's perfectly reasonable to adapt policing in the light of the current wave of terrorism that's been spreading in Europe (and not only there).
Note that I'm not saying that encryption should or should not be banned, or that either way is/isn't a good way of fighting terrorism. I'm just pointing out the weakness of the "but whatabout XYZ" argument.