There's no doubt Bush's actions were utterly disastrous for America and many other countries, as well as their people, but it becomes a very different debate when you consider the two scenarios of Bush lying and Bush believing the intel, and then sub-scenarios like if Bush was primarily misled or mistakenly misinformed.
Hypothetically, there could have been no lying anywhere in the chain (even among the lowest-level intelligence analysts and informants), or some scattered lying, or a ton of it from bottom to top. Until that question is satisfactorily answered, it's hard to know who, if anyone, should belong in prison over the matter.
One of the most impactful consequences is that in most debates I now see, very few people believe the intelligence community when they make any claims about anything, including almost two decades later. For example, claims of election interference and espionage by the Russian government can be and frequently are easily dismissed by citing the WMD incident.
That alone has driven a lot of the civil tension over the past 4 years. (And of course this will remain the case no matter how one considers the deceit vs. mistake argument, since either way it means the IC is much harder to trust.)
