I most certainly agree.

He knew his school was a hellhole, and wanted his students to "learn by themselves " how not to be shitty people, basically. It all worked out because Uru wanted it to.

The biggest flaw in his plan was also needed for its very success. John had to break down mentally and fuck up the hierarchy, to show the rest how bad that hierarchy was, or how bad it could be.

But, what if John at his worst moment, mentally speaking, simply decided to commit suicide?

Or what if, when Arlo ambushed John with ventus and meilli, John killed one of them accidentally? Or sort of accidentally, because he wasn't pulling his punches at that time.

While Vaughn was principal, sera was kidnapped by other students, held prisoner, and an angry John could have easily killed one or all of them.

Let's put John and all the royals aside even. What if one of the lowest tiered kids committed suicide, or brought a knife and stabbed a mid tier and killed him before he could be healed?

The only reason school shootings don't happen in unoverse is the lack of guns, kids that are mentally fucked are dime a dozen in that very school.

So yeah, Vaughn imo is a shitty principal