The means NEVER justifies the ends.
So, to start with the premise "the means justifies the ends" automatically means you are not following your highest joy.
"overjoy" - i do not know how you mean this word. It is not my word.
Highest joy - as opposed to lower joys. It is joyful to sleep in. It is more joyful to complete life goals that are exciting to you.
Indeed you'd say that as I pointed out, the Self-Righteous will justify it as that and they will certainly be overjoyed with it, and you were saying that bringing joy to others is a folly and universally so.
Overjoy is higher than the highest joy.