What is the connection between Christchurch shootings and Popular YouTubers' "PewDiePie"?

What is the connection between Christchurch shootings and Popular YouTubers' "PewDiePie"?

With Christchurch shootings on innocent Muslims, the entire world which shocked with this news has strongly condemned this barbaric attack.

Before the shooting, the terrorist demanded to subscribe to popular YouTubers' "PewDiePie". Recently, "PewDiePie" published a video against India' T-Series which is aiming for the top YouTube channel award which have more subscribers.

Over this "PewDiePie' made comments against Indians.  Coming to Christchurch, the shooter wanted everyone to subscribe to "PewDiePie".  About this YouTubers', Tariq Nasheed warned two years back about their 'White Supremacism'.

He also warned this white supremacism definitely brings trouble to humanity.