A soon-forgiven liar revealed scene or the suitably mourned and quickly avenged death of a sympathetic character by a villain are not even remotely on the level of the protagonist we’re rooting for causing genocide without remorse or consequences.
Why would the “lying” scene even remotely matter when Tim Allen’s character killed their entire civilization? That’s a much bigger deal than lying about being a space captain! Why would they put him in charge again without even explaining his error?
This is what I never understood. The principle of respecting the autonomy of other cultures is good imo, but what “cultural contamination” could be worse than the total extinction of the civilization you’re trying to protect?
Applying the Prime Directive in such extreme circumstances turns it from an anti-imperialist ideal to a Social Darwinist one.