Calm down.
People, whether conservatives or liberals or libertarians, are always going to have a wide range of opinions on the hawk/dove issue.
To despise somebody in a knee-jerk fashion just because they happen to disagree with you about fighting some war or other is a rather oversimplified way of going through life.
If a hawk or dove supports their position conscientiously, that's a little less cut and dried than branding somebody a liberal or a conservative.
There are liberal hawks and conservative doves, and libertarians who believe in preemption, and those that don't, etc. so think for a minute before you start despising somebody on that basis alone.
Here is how I would handle it.
1. Reiterate points made in Bush's 2003 state of the union address;
2. Admit like in all wars mistakes were made but Iraq was won during Bush's administration as trumpeted by Biden and Obama in 2009 when they admitted Iraq was in great shape; and
3. The big mistake was made by Obama by pulling out US military might.
The result of of Obama’s HUGE mistake led to the following:
1. It allowed the unpopular Shia elected government to act even more irresponsible;
2. The US had no human intelligence;
3. The US lost all credibility in the region;
4. Finally, Obama’s apology tour, Arab Spring adventure in Egypt, support of the Muslim Brotherhood in Egypt, the Libya Adventure and the Syrian Red line back track only inspires our enemies, i.e. Iran.
So, what do I do? I go to FR for some solace and what to I see WilliamIII comments.