Mike, I know one possible answer... it's called an Unwavering Devotion to the Wrong Message
It appears that Ms. Agte, Ms. Maier and Ms. Gouldthorpe haven't changed the message they keep telling themselves, and their followers, about Erie Canal Embankment safety. It's been the same since their inception and you can file it under classic "Denialist".
Why does this Facebook Group keep insisting nothing is wrong with the Erie Canal when the OWNERS of the property have stated otherwise?
Are these three people doing it for the same reason that other's deny the "science, truth & facts" around a given subject like public safety or dam maintenance?
Some of these types of people believe if they tell a lie long enough it will magically become the truth somehow... we see plenty of that going on these days.
Some of these people believe their "valued opinion" should mean more than scientific fact or and all known best practices by those intimate with said topic.
And a very few people, like the Leaders of this Facebook group, actually believe both.
But sadly they also don't understand why they have to keep repeating their same tired lies and opinions that don't add any value.
They can't seem to figure out that the TRUTH will always win over the lies that people like them makeup to deny those simple truths.
They also can't seem to figure out that Science & Engineering FACTS will always win over opinions of people like them, who aren't adding value to the overall solution.
So why do they keep saying that there is NO danger to the Public having trees covering all these raised embankment dams along the canal?
Its simple... It's because these three "Facebook Group Leaders" are still trying to silence those little voices in the back of their own heads that keeps telling them they are wrong, and that trees are a danger to all dams... Its all spelled out by Science & Engineers.
And that is not an opinion...it's Fact.