I don't know. I was horrified that one of my friends voted UKIP (I think because they weren't satisfied with the mainstream parties), but if they can't see why it's unhelpful to do so, I'm not sure what'll change their minds. I *hope* they'll be horrified at the amount of power UKIP has gained in this election, and do something more constructive when voting next time. Spoiling the ballot paper is strictly better than voting for racist and sexist parties.
I'm sadly not well enough to go out campaigning as well as doing a(n awesome) full-time job. I don't know how we stop this dreadful 'othering' of people from other countries, other races, other (dis)abilities. I think we can change it - I can remember the mid-90s in the UK, when the right-wing parties were doing well at local and European elections, and there was a big fear that national politics would swing right. But it swung (slightly) left, and the Conservatives were out of power after 18 years. So it is possible to turn it around, provided the parties of the left start providing a consistent, powerful message.