That guy's a nutball, not deserving of your attention. He probably didn't get hugged when he was little and is pissed off at the world. Answering him only feeds his crap and newfound feeling of empowerment.
At the same time, as the father of a veteran of Iraq, yet one who is disappointed in the choice the country made to go as we did, when we did, I'm still no less proud of my son's service, nor less proud of my advice to him through the years that led to that choice.
While it's naturally difficult to lend support to someone who disagrees with you, it's exactly the freedoms that support that as a right that make this a great country and, when necessary, one worth fighting for. I actually feel that there are some trends that lose sight of that aspect of what makes the country great, but also feel they'll work themselves out.... as long as we don't mess too much with the Constitution.
An anecdote that has served me well anytime I get the feeling that the world should think like me, by force, is that of the Jewish lawyers, working for the ACLU, who met with and supported the Nazi party's right to demonstrate and have a parade up near Chicago. The town wasn't going to grant them a permit and those lawyers actually met with the Nazis, pled their case and WON, based on the Nazi's Constitutional rights. Can you imagine what conviction to the Country's ideals, at the expense of their own sentiments, that such an action must take? They defended the Nazi's right to express their opinion, WHATEVER it was, and THAT'S a big part of what has made this country great. Not the Nazi's opinion, but their right to have it and express it. Those Jewish lawyers expressed PURE patriotism in my book, fighting an issue that HAD to be about as distasteful as it could be for them personally, yet rose above their personal feelings for a right that STRENGTHENS our country, not weakens it, regardless of the voiced opinion. THAT'S conviction. We always have to be careful not to throw the baby out with the dirty bathwater.