Because there is no one way that any particular "we" want the trail to be. Some people want fewer hikers, some want more. Some want more culture: things like hostels, shuttles, trail magic, etc. While others want to reduce services and make the trail harder to complete and more like west hiking. Some want to knock down the shelters and some want more shelters. In this particular case, one "we" thru hikers want things one way and one "we" Baxter SP officials want it another.
To me, it is 100% reasonable to have champagne at the top of a mountain. That is against Baxter State Park rules, and the rules lay out some sort of punishment for doing so. It is therefore also 100% reasonable to me for someone to drink champaign at the top of Katahden and get fined for it. That doesn't make the champaigne drinker a bad person and that doesn't make the ranger issuing the fine a bad person. I don't see why everyone can't just all follow the rules and stop whining that someone broke them. Just fine them and move on. Let the recipient of the fine either pay it or fight it given reasonable due process. If the fine isn't big enough to stop bad behavior then get more rangers or higher fines. That goes for stealth camping, or anything else that is against the rules. This really isn't hard.
If too many people are entering the park then make a rule about that. Plenty of places have permits, then make a rule to handle situations where people don't have permits and enforce them. If there aren't too many people entering the park, then quit complaining about all the people.
This all seems like a failure of Baxter State Park to enforce their own rules or to have the correct rules in place. Make reasonable rules and enforce them. Maybe in addition to fines you can have a lifetime ban as punishment. None of this is the ATC's fault, nor can the ATC fix any of these supposed problems. Even if Abol Bridge becomes the official AT end point according to the ATC I am sure as hell going up K immediately after my AT hike ends.