If you didn't overemphasize the good parts and downplay the bad parts you might find out that maybe you shouldn't really like what Tesla is doing at all, or you'd have a legitimate reason to like Tesla.
What you shouldn't do is overemphasize the good parts so you can feel better about your decision to like Tesla. Then your conclusion has been fixed from the start and you're adjusting the facts to fit to avoid cognitive dissonance.
If you didn't overemphasize the good parts and downplay the bad parts you might find out that maybe you shouldn't really like what Tesla is doing at all, or you'd have a legitimate reason to like Tesla.
What you shouldn't do is overemphasize the good parts so you can feel better about your decision to like Tesla. Then your conclusion has been fixed from the start and you're adjusting the facts to fit to avoid cognitive dissonance.