Everyone can be a target

Seems like a cultural thing. Cops in Germany are allowed to carry their guns off-duty, and when in uniform they're allowed to travel in any passenger train they want (2nd class only) for free. Guess this is because unlike the US Germany doesn't have dedicated "railway cops" and enough regular cops use the trains that way to provide on-board security.

In France alone, the top incidents come to mind:

https://en.wikipedia.org/wiki/Paris_massacre_of_1961

Most recently

http://www.theguardian.com/environment/2015/nov/27/paris-cli...

There's also broad, overreactions which sweep up too many innocent people onto various watch lists... topping more than 2 million unique individuals in U.S. federal databases alone.

There are multiple, competing, political interests and personal agendas spanning the gamut of LEOs and officials to do what they do, in addition to ignorant discrimination and ostensible public protection reasons. Sometimes they just "don't like [someone]" and want to cause that someone misery based on how they look, talk, etc.

Likely security is going to become so omnipresent before it stops becoming a nuisance. In a world where irrational people can travel practically with immunity, where they can gather materials to cause great harm, many will not want to pay the price for their freedom. So security would need to become so integrated it just fades into the background.

We can bemoan our loss of freedoms all we want but it never ceases to amaze the very same people posting such a complaint will none the less turn right around and demand government take action against someone doing something they don't approve of or take over services they think they are entitled too.

So get with it, you give the government an inch they won't stop taking. Just as quickly as you demand they take action against those you don't like you should fully expect someone to ask them to actions against you directly or indirectly.