Trees can get pretty political. The roots of problems like these in the US often go back decades to right-wing tax cuts. It doesn't even have to happen on the city county level as federal and state cuts can often result in budget shuffling.
But honestly, it's even more complex than that. Causes of public tree decline are many and largely uncovered by media.
Tree Budget Cuts have made Parks, Bikeways Streets and Front yards less safe
By Alan ‘Lorax” Hirsch Tuesday item 7 before council is the first public discussion about the up-to-now hidden part of city structural deficit; the underfunding of tree pruning/sustainability program. This underfunding has not only made our parks, bikeways and streets less safe, but also added to our structural deficit by...