Not a question of people who are sceptical of the idea that military interventin will do more good than harm being "aligned with UKIP and the Tea Party". It's a matter of being in agreement with the great majority of people in the UK and USA, as demonstrated in numerous polls of public opinion.

Military intervention leads to a number of possible outcomes. One is that it makes no difference to the war. One is that it actually strengthens Assad, by bringing increased backing from Russia. One is that it brings about an Oppositin victory.

And an Opposition victory is likely to mean a regime in power dominated by Al Qaeda (or by even worse possibly) or a puppet regime dependent on continued outside to survive, as is the case in Afghanistan. And as in Afghanistan that support will be remved and it will rapidly collapse.