If people were doing this for clout/ad revenue or on a whim without trying to engage with the proper channels first I would agree, but it just isn’t reasonable to tell people to accept living in an environment full of garbage while their local government does nothing about it for literal years. If you walked along a river in your neighborhood with your pets and/or children how long would you accept seeing it choked with trash and sewage? Would you be okay with teaching them, through inaction, that this is fine? I’m not asking for you to answer, I just think all those things deserve as much consideration as ‘could this cause a flood if XYZ happens?’ Because of this has already caused a flood we clearly would have heard about it.

To me, this was a good faith effort made in the absence of any other resources. If this was load bearing garbage (!) then that needs to be communicated in their refusals/delays, along with a specific timeline for addressing it. That’s also assuming they have detected a real risk of significant flooding, which I’m skeptical of.