I mean, there have been far more overtly extreme people than Farage elected to the House of Commons. I don't like him, and would never vote for him, but the idea that FPTP is a catch all barrier against extremism falls apart the moment you apply any thought to it.There is an infinity of mischief to be had.
He would double down on persecuting diversity, for starters.
No, I don't want ****s like that anywhere near parliament, let alone the cabinet.
They laughed at Hitler......
He could get elected if he chose to join the Conservatives and stand as an MP for them, but he can't deal with a situation that requires responsibility or dealing with other people (and nobody wants to deal with him in that sort of situation) so he sits on the outside pissing in. He'd never be appointed as a minister for the same reason.