If your point is that Corbyns policies couldn't just consist of lets not do this or lets not do that then I fully agree, basically doing nothing abroad would still be a kind of policy I guess (isolationist) but there has to be some things you actually plan on doing other than criticising everyone else's decisions and doing nothing all the time.
But doing nothing is the best thing to do sometimes, during the build up to Iraq there wasn't really many options specifically in regards to our potential invasion of Iraq other than whether to do it or not, It isn't as if we had to invade a country and although Iraq turned out badly it could have turned out even worse had we gone for the other country.
I can understand your argument that the Americans might have eventually wanted to reach a military solution to their problems in he Middle East but our support of such things just encourages them and perhaps in the long run might actually mean more military solutions, also just because the Americans are about to make a mistake it doesn't mean we have to join in with them. By supporting them strongly when they are doing the right thing but not supporting their mistakes we could be a positive influence on them.
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