It is also a useful trick to keep in mind the opposite of critical thinking - following the herd. Just copying everyone around you is often a great strategy. So good that even if everyone around you are making mistakes it can still be the dominant strategy (there is a reason a lot of people who don't like war are cowed into silence when war fever descends). Most people are using it.
That implies that it is ridiculously easy to be right when everyone else is wrong. People aren't trying to be right. Any sort of principle-based analysis easily outperforms the herd. When leaders in society start lying that is indeed one of those situations. Pretty much any situation where everyone knows something and the hard statistics are telling a different story is.
The more pressing problem is how to go from a lovable Cassandra to someone who can preempt major events and convince the herd to not hurt itself in its confusion. Coincidentally that is how markets work, people who have a habit of being right are given full powers to overrule the mob and just do what they want. Markets don't care if everyone believes something. They care if people who got the calls right last time believe something.
In this case, the US hasn't seen a good outcome to a war since something like WWII and even there they waited until the war was mostly over and the major participants in the European theatres were exhausted before getting involved. The record is pretty bad. Iraq was an easy call to anyone who cares about making accurate predictions.