It is not about politics at all. You can convince even the hippiest left-wing peaceniks into terrible activity.
All you have to do is fixate the subject on either side of a dialectic argument involving force, violence, duress .. injustice. Or even better, all of the above.
The root of all radicalisation is individual responsibility.
I mean, something to balance and show some equivalence?
You don't.
Because the single biggest real threat to any US citizen today is an other US citizen that can grab a weapon at will.
And it happens that in the overwhelming number of cases, the person that becomes a mass-murderer is a white, conservative, pro-right, pro-weapon, pro-republican.
Not acknowledging this is either total denial - or total complicity.
And. This is totally about politics (how a government deals with its people). NRA politics; that serves a very specific ideology.
Look in Wikipedia this category: https://en.wikipedia.org/wiki/Category:Mass_shootings_by_cou... - then browse by country.
All countries, but the USA have sporadic sub-articles. USA has whole sub-categories.
USA are the _single_ country in the world where there are as many mass shootings, every year. When there are been more than 250 in the USA in 2019, there hasn't been even 10 in any other country in the world.
(to the down voters: downvote as much as you want guys - facts are facts - you are only deluding yourselves - you should look in the mirror more and stop considering the USA as the center/perfection of all things, because it's not)
So? The world knows that American's are okay with violence. We haven't been hiding ourselves from its victims, or at least .. a big portion of the world sees and knows all too well, what most American's don't or won't: a principle product of the USA is violence.
Either way, the two (radicalisation and contagion) aren’t mutually exclusive. In my opinion a large part of the motivation behind these shootings is the potential for fame and for the actions to be seen by the whole world - regardless of whether they’ve been radicalised or not.
And the fact you made an account specifically for writing what appears as rational arguments but aren't at all (and are in fact dog whistles), doesn't go in your favor.
But there is absolutely crowdsourced coordination on identification of targets, weapon platforms, and methods. And as everyone on HN already knows, crowdsourcing is a highly effective tool for getting things done. It works just as well for terrorism as anything else.
Uh, have you heard about the KKK?