Hmm, sorry for necromancing, but this pic reminded me of something, for those local artists making pics and series, if you ever need an idea for a series of comics, why not follow this pic's example and make a "SAW" series with yukkuris being the victims (but probably being moar like Asshole Victims imrite?)
Some, some just either were typical dudes with issues but Jigsaw thought that his method of "inspiring" would make them to move on their issues and crap like that.
It was a mixbag, some really were douchebags while some weren't.
Yet since we are talking about yukkuris, i doubt we would have a mixbag group, instead we would have 100% bad yukkuris in that situation, if any of them is a "scum with potential" that's another story but overall the point is to use the SAW style to grab the manjuus, gives them pain while drilling them the reason they suck.
Probably not effective aside of killing them, but it would be fun, and i bet it would be an interesting experiment to come out with creative "traps" and "devices" for the manjuus to be faced with, plus it always feels cathartic when bad yukkuris get told on their shit, regardless if they won't awknowledge it or understand it.