Josephus,
I don't disagree with your assessment. However, when it is said that people must take responsibility for their actions, most observers tend to overlook that only the crazy would carry out a random atrocity.
When the human targets are picked according to a certain affiliation my guess is that strategic planning came about by the perpetrator's beliefs being discriminated against which in turn triggered the planning.
The only reason the NZ (Australian) shooter targeted Mosques was on account of a history of Muslim atrocities ! The same reason really that Muslim extremists are targeting Westerners.
There is no excuse for either, full stop !
Stupidity is probably mankind's worst affliction and, as history has shown, more will be on display before long ! Whites, blacks, Greens, & Brindle stop being stupid !
I for one hope that people of all creeds will sit back & think more & if they can't I hope that those who can will continue to try talk sense into them ! We can only achieve that if the media, educators & entertainment industry get on board !

The The live-streamed massacre of now 50 dead in
New Zealand mosques underlines the reach of a
movement that preaches imagined "European ideals"
that rejects immigration and shares demonisations
and vicious threats and attacks over social media
on the internet. We can also take a look at our
own country's history to put things into perspective
as to why some can be influenced by this thinking:

http://www.theguardian.com/commentisfree/2019/mar/17/australians-are-asking-how-did-we-get-here-well-islamopobia-is-practically-enshrined-as-public-policy

cont'd ...

My apologies for the typo.

Here's the link again:

http://www.theguardian.com/commentisfree/2019/mar/17/australians-are-asking-how-did-we-get-here-well-islamophobia-is-practically-enshrined-as-public-policy

As you sow, so shall you reap.

I've most likely seen, more violence than anybody else on this Forum. And I'm not boastful. Making me an involuntary victim if you like. Violence in all its forms is positively ugly. There's only one thing worse and even more hideous & revolting - 'Revenge,' pay-back or retaliation!

There is no winner, only losers. Invariably you have to front up to someone's front door, and as sensitively as possible explain, their son, husband or brother will not be coming home - ever! Often leaving a family shattered, and wondering why?

RUNNER said, '...Blame is man's corrupt heart - So very true.

Followed by FOXY's wise JFK quote, '...violence only begets violence...'!

And I agree, the 'news hacks' in our corrupt media, have done so much damage, with their biased, inaccurate reporting

o sung wu, Not very well put with the JFK quote you conveniently ignored the more important quote from JFK "Those who make peaceful revolution impossible will make violent revolution inevitable."