Somewhere on here there's a starry-eyed trip report of me hiking to Norvan, decked out in denim in the pouring rain in April. A couple years later I solo'd the Stein Traverse.
It's a matter of education, not shitting on people. The problem is that Joffre has hit a critical mass of foot traffic, creating an environment of complacency in which you cannot educate people. MoT needs to remove the ability to park on the highway in order to greatly reduce the daily capacity, thus restoring the feeling of "Wilderness" to the area, which will make it harder for people to shrug off safety concerns by virtue of being surrounded by fellow humans. The concern should not be "fake" hikers clogging the parks for perceived "lesser" uses, but that hikers being introduced to the backcountry at Joffre will develop bad habits which could harm them if they carry them over to a more demanding trip such as Wedgemount or Athelney.