Again, this is a largely erroneous view.  Experience where it is already used indicates that whilst it can reduce the number of seats that any single party can win, the overall result is that you get smaller majorities rather than no majorities, requiring a single party in power to work with other parties on specific bills, which would - generally - result in fewer examples of 'extremist' legislation.

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Andy,
Considering there are only three countries that use AV for national elections, I don't think you can talk grandly about "Experience where it is already used indicates" Australia is one of those countries and they absolutely loathe the system.
And what are these examples of 'extremist' legislation". Perhaps it was the nationalisation programme carried out by the Labour government in the late 1940's or perhaps the programme of privatisation carried out by the Tories in the 80's!
AV doesn't give power to the people. It will put the country at the mercy of behind the scene deals by power hungry polititions.
AV also destroys a fundamental principle of democracy, one man, one vote!