Re: @tom dial
The US (and Canada) have police and military agencies with missions that include protecting residents against various internal and external threats. Their activities inevitably interfere with or limit the actions of those residents and others and cost a lot of money. Contrary to your assertion, it is perfectly reasonable to discuss the extent of those limits, the cost of operating those agencies, and whether they are effective in carrying out their assigned mission.
It is not clear how failure to have universal background checks on private citizen gun purchases or to restrict ownership of semiautomatic weapons is evidence of a tyrannical regime; the natural interpretation would seem to be quite the opposite. Ownership of automatic weapons has, in fact, been tightly controlled for a very long time in the US.
Targeted killing of civilians, citizens or not, is to be condemned, as is perpetual imprisonment without due process. It is not, however very common and to describe it as the norm for the US is a rather extreme overstatement.
"The people with sand and more sand" killed quite a few, almost all civilians, in New York, Washington, Pennsylvania, London, and Madrid between late 2001 and mid 2005. I don't offer that to justify anything but the proposition that they may be worth worrying about, just a bit.