At least you now admit it's a minority
No place ever looks "the same as they used to"
No, they didn't "have to". There's been no such attacks in San Sebastian (beautiful place btw), and afaik just the one in Las Ramblas nearly a decade ago? There's in fact been way more *non-islamic* vehicle ramming incidents in Europe in the past decade than islamist.
So my "guess" - based on actually looking at the data - is that installing bollards is a cheap and effective way to protect pedestrians and it has nothing to do with Islamism at all.
The question is ... given far more non-islamist incidents than islamist ... why do you think islamism was the motivation, and if it in fact was ... why only a response to that and not to the non-islamist incidents?
Again ... why don't you think about all the non-islamist incidents they protect against? This reveals *your* thinking, which likely results from where you have been sourcing your information and views.
Good that you are here now!