Put it this way. In 2003 the largest protests in human history took place against the Iraq war. Millions of people demonstrated against the war globally. Two thirds of the Australian electorate opposed going to war.
At the time there was a movement calling itself the "decent Left" which supported the invasion, and there were well known protean public intellectuals like Christopher Hitchens who were among its leading advocates. As well as the usual frothing right wingers.
The US invasion of Iraq was a geopolitical disaster. It directly caused hundreds of thousands of civilian deaths and indirectly has led to about a million more, and to the geographical extension of IS controlled territory in western Iraq and Syria.
It is worth pausing for a bit to consider the scale of that atrocity I think.
When you see the same people who advocated war on Iraq doing the same thing again today—with the same half-baked rationales and false claims they want to end tyranny and save lives, without a jot of hesitation given the historical record, it's truly disgusting. They're evil fuckers and we need to get them out of our public debate.