That was Tarrants whole reason for shooting up those two mosques, he says in his manifesto that he chose guns as it would make a bigger impact and cause a debate in the US over gun rights and the 2nd amendment, which would eventually lead to gun rights in the US being restricted and inevitably lead to a civil war. In his view, this would balkanise the US and split the population into different sections based on race and bring whites closer together and fix white birth-rates.... or something.