Valid concerns that are underpinned by improper urban forestry practises regarding the health of trees.
I’d guess we need to move away from the ‘street tree’ as a singular unit and place it into the ‘urban forest’ where trees die on the regular in a natural succession. This includes parasitisation, standing and fallen wood (and leaf litter) etc. We need forest layers.
Bit hard now that the cities are places for cars to drive around but there is hope for the future!
One thing that old people used to say to us is that rapists and/or snakes hide in the undergrowth. You can’t win.