Why are Progressives so violent?

UK Government Minister: I had more death threats from the Greens than from IRA terrorists:

Former UK Environment Secretary Owen Paterson - recently sacked in Prime Minister David Cameron's reshuffle - said today that he received more death threats from green activists than ever he did from Republican and Loyalist terrorists during his stint as Secretary of State for Northern Ireland.

The Northern Ireland posting is considered one of the more dangerous jobs in British politics, which is why the incumbent - unlike with most cabinet positions - is automatically given 24-hour armed protection.
But according to Paterson, his stint as Secretary of State for the Department for Environment, Food and Rural Affairs was much more perilous.

I soon realised that the greens and their industrial and bureaucratic allies are used to getting things their own way. I received more death threats in a few months at Defra than I ever did as secretary of state for Northern Ireland. My home address was circulated worldwide with an incitement to trash it; I was burnt in effigy by Greenpeace as I was recovering from an operation to save my eyesight. But I did not set out to be popular with lobbyists and I never forgot that they were not the people I was elected to serve.

Stay classy, Progs.