Is it a Good Thing that Racists are Allowed to Vote?

From the LA Times:

"Exit polls from Pennsylvania showed that about 20% of voters said race was a major factor in deciding whom to support. White voters who cited race as a factor went for Clinton by a 3-to-1 margin."

So, should racists be allowed to vote? (And this applies equally to white racists, black racists, Hispanic racists and Asian racists)