Getting rid of Saddam is one of the consequences of what happened, but by no means the only one.

However desirable that consequence might have been, it was carried out through an illegal war, launched on the basis of lies. In legal terms, it was a terrorist action, and that has terrifying implications for the future.

So far as Iraq is concerned it is too early to be sure of the outcome, but it seems likely that there will either be a popular Islamic Government, which will not be friendly to the USA, or there will be an imposed puppet regime, which will need to be repressive if it is to survive, and could well bear considerable similarity to Saddam's regime in that respect. In either case considerable civil disorder, possibly amounting to extended civil war, seems likely.