well this a very good question,
Spain went to war but 90 per cent of the population was against it. It was a gouvernment decision, and it is quite the same in the UK, most of the population is against that war (somtething like 55percent).
The problem is NOT fighting terrorism.
But more feeling that the reasons we have been told to go to war were wrong (and all of them!

.
I can speak as a French guy,
I definitely support the war on terrorism but going to war is another thing, here in Europe we have experienced many war over the past 150years, destroying our soil, buildings, cities and killing our parents etc...
Things that has not happened to the US ground. So we are always pretty cold to send troops unless reasons are EVIDENT.
I know we are starting a HOT topic here,
but I will be interested to discuss it, hoping we won't reach the same level we did on Ugay forum, where basically the discussion was one way even if they were wrong.
Parwell