Alternative voting

I read in the news the other day that Tory peer baroness warsi is campaigning against AV, as she says it will "give oxygen to extremist parties", and her comments were soon picked up by the anti-AV Sun newspaper.This is because she says AV is one step towards PR, which was a system which the BNP won seats in the euro elections. First of all what does baroness warsi know about elections? If she actually won one in her life she might have an opinion worth listening to. Second of all, who the hell does she thunk she is? She is basically implying that the public are too stupid to not vote for the BNP etc, and thus cannot be trusted with a fairer voting system. First of all, the BNP are campaigning for a no vote, as AV doesn't promote extremist parties. And secondly, even if it did, if enough people vote for a party, they should have their voices heard, even if they are extremist. FPTP is flawed as it is biased toward Tory and labour, and thus these parties are less accountable to the people. I would much rather have a system which allows the extremist parties (however bonkers they are) to allow the "mainstream" parties to have a kick in the balls once in a while, than the Labour-Tory duopoly we have now.