that's not foresight though, that's speculation

why i've been dismissive of hindsight is because, at the time the build up was occurring, very few people were speaking out against invading, and now many of the people that agreed think its a bad idea. There's no problem with changing minds, but faulting people for a view that was shared (at the time) is a bit tough to swallow (though you very well may have said its a horrible idea back then, i kinda figured our reconstruction would be bad based on afghanistan).