No, reactionaries should be rehabilitated to the best of society's capabilities. Participation in society isn't sacred, the purpose of democracy is to deliver the best results for the most amount of people. Reactionaries that wish to expel and murder minority groups should be treated as any other violent criminal, through rehabilitation if possible.

Should openly fascist people be allowed to vote [for government] in your opinion?

Why should they? As in, materially, how does society benefit from that? How does the democratic decision-making tool become more useful from it? I consider democracy to be a decision-making process, so I don't care for vague idealistic assertions like "every adult should have the right to vote" unless there's a benefit from it. And allowing an explicitly anti-liberal, anti-democratic, bad-faith opportunist (and fascism is explicitly and openly all of those) to vote is harmful to the democratic process and increases the odds of it making a bad decision.

Openly fascist people should not be allowed to draw breath.