Kid seems to have been a lone nut. Bullied at school, had a pic of Anders Brevik as his whatsapp profile photo and no links to IS.
Lots of racists who screamed about deportations, decried doom and talked bullshit about "no go areas" and enclaves all look to have been wrong. Again.
This incident is just another example of the 'Lone Wolf Syndrome' whom ISIS leaders have zeroed in with their constant propagand and urges for the muslims of europe and America to take these kinds of actions.
The kid had a connection with ISIS...in his mindset...these kinds of people aka muslims with personal problems are a tragedy waiting to happen...steeped in the belief they will go to paradise if they comitt these sorts of actions against western infidels(aka you and me)
Thus when their life gets difficult, they see themselves as losers and failures.....they come to the conclusion they can redeem themselves and make their miserable little lives somehow noteworthy by engaging in jihad....not rocket science...just something our current leaders will not face up to because it goes against their liberal narrative.