Possibly because they’ve been so sheltered and have been drowned in the cult of multi-culturalism while hearing the drone of “refugees are welcome” due to some misguided virtue signaling.
I find the EU media to be very capable of controlling 95% of the information people hear. It’s almost like everyone uses the “NPR tone”. A quiet and reasonable voice, one that omits many facts and leads everyone to the only “reasoned” conclusion - always a leftist position. If you don’t agree you’re the bigot the media talks about.
...just ignore the fact that 90% of the “refugees” are fighting age men.
From some of the videos I’ve seen, one included a flatbed truck carrying at least 40 men, all dressed in black ski masks, black sweaters, black pants and black shoes. They were all uniform. So this is organized and has already spread to Belgium and elsewhere. It is beyond the “racist French police” argument.
Maybe this has been in planning for a long time and this incident (17 year killed) was just a convenient trigger.