"Lied to".
Kind of like "Iraq definitely has WMDs" circa 2003? The primary rationale for Gulf War 2 was simply fabricated.
This is what governments do. But in the end, the simple question begged is, "What is the right thing to do here?"
Did the ends justify the means with Saddam? Was the US and the world a better place with him dead, or did we simply trounce a sovereign country unjustly?
Sovereign Ukraine was similarly invaded by Russia without "legitimate" casus belli. In the end, would the world be a better place if Russia wipes out Ukraine and annexes it?
I think not.
And that is what this war is all about.