Cause we don't live in Comrade Corbyn's Commie Cosmos, thank god. Plus most people are just sick of Brexit taking so long, with an greatly unrepresentative and undemocratic parliament. To where we have had Spineless May just kick the can down the road blaming her electoral failings on Brexit whilst sticking to her hardline tory domestic policies which were the real reasons she missed an open goal, turning her into a laughing stock, and to this day seemingly unable to still see the problem. Whilst on the other side we have Jezzer the Depresser who is only leader of Labour because the Tories shot themselves in the foot, offering no real solution to literally anything, and just complains constantly, whilst bending to the will of Blairs children who have no respect for democracy and can't see more than 6 feet from their back yards. Then elsewhere you have the Lib Dems masturbating over Junker and Tusk, SNP who want independence from the UK but not the EU, no wonder drugs in Scotland have hit an all time high, and Sinn Fein who make a lot of fuss but can't even be fucked to trudge to Westminster.
Say what you like about Boris, at least he is optimistic.