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?