And while military training is not police training, there was some controversy and some generals said it was a huge mistake, as the money spend on this operation (~1M$) would have shown better effect if spent on intelligence. Also, to afford the men, military had to cut monthly training. A friend of mine said that physical exercise/conditionment was divided by 2, while tactical and shooting by 4, but he really hated this operation so take it with a grain of salt.
I grew up with a real combat rifle in the house, not a bump-stocked semi AR that looks scary. Complete with ammo. Same in a number of other houses in the neighborhood.
Never had reason to worry.
But I guess it might seem scary to Americans.
[0] page 53 of this official report: http://www.assemblee-nationale.fr/14/pdf/rap-enq/r3922-t1.pd... (gist: neither the head of police nor the army allowed the soldiers to open fire, arguably for good reasons, but then what's the point?)
From what I have seen UK police usually carry no guns like outside London. In the Netherlands usually pistols. In Poland where I am from I have not seen Policeman with machine gun only military and special occasions.
Shooting by the Police happen but it is like one in 3 maybe 5 years. Where in states it seems from my point of view every month at least (never been in states so it might be skewed).
[1]: I think they were m4s but they could be another similar looking rifle, I'm no expert.