From the wiki page: Mair had links to British and American far-right political groups including the
neo-fascistNational Front (NF), the United States-based neo-Nazi organization
National Vanguard (the successor to the defunct
National Alliance) and the
English Defence League (EDL); he had attended far-right gatherings and purchased publications from the National Vanguard and other outlets,
[1][22][23][24] to some of which he had sent letters and expressed support for
South Africanapartheid.
[25][26][1] In his home were found Nazi regalia, far-right books,
[20][27][27] and information on the construction of bombs.
[1][24] He had searched the internet for information about the
British National Party (BNP), South African apartheid, the
Ku Klux Klan,
prominent Jewish people,
matricide,
[20][27]white supremacism/
nationalism,
Nazism/
Nazi Party,
SS/
Waffen SS,
Israel,
mass shootings,
serial killers,
Frazier Glenn Miller Jr.,
William Hague,
Ian Gow (another assassinated MP),
[1] and
Norwegian far-right terrorist
Anders Behring Breivik (about whose case he collected newspaper clippings). He also owned
Nazi iconography and books and films related to the Nazis.
[28] A police official described Mair as a "loner in the truest sense of the word... who never held down a job, never had a girlfriend [and] never [had] any friends".
[1]The Guardian said that he "appears to have fantasised about killing a 'collaborator' for more than 17 years, drawing inspiration from"
David Copeland.
[1]
I think this clearly shows Brexit, while it probably had some part to play, was not his only fixation and the guy was a ****ing froot-loop.