Why did the NZ Shooter Choose Firearms?

In Brenton Tarrant's alleged Manifesto, the New Zealand mosque shooter states the following:

“I chose firearms for the affect it would have on social discourse, the extra media coverage they would provide and the affect it could have on the politics of the United States and thereby the political situation of the world. The US is torn into many factions by its second amendment, along state, social, cultural and, most importantly, racial lines.

With enough pressure the left wing within the United States will seek to abolish the second amendment, and the right wing within the US will see this as an attack on their very freedom and liberty.

This attempted abolishment of rights by the left will result in a dramatic polarization of the people in the United States and eventually a fracturing of the US along cultural and racial lines.”

In other words, he knew his actions would spur the US government to pass new gun restrictions.

Take some time to think about this. The hope of banning firearms is the stated primary motive for the attack at Christchurch. The predictable knee-jerk response from the right is also anticipated.

Despite the overtly Hegelian nature of the plot outlined in his Manifesto, the politicians and media have no qualms about fulfilling Tarrant's stated objectives on his behalf.

This should be considered more disturbing than the shooting itself (which is absolutely horrific).