i am not sure if this is true but george lucas supposedly named episode VI return of the jedi instead of revenge of the jedi to save on ink costs. i am almost completely sure it is not true but i have not yet seen a debunking of this otherwise wacky idea that is plausible, given we are talking about george lucas here.
I always heard the reason for that as “Jedis would never seek revenge”, or something along those lines. Bottom line was that being a Jedi was incompatible with the idea of revenge.
