I'm from Sheffield and have seen the tree felling first hand.
At first I wasn't paying too much attention, as trees do sometimes need to come down and be managed, and there are people who mean well but will woollily campaign at any tree-felling, which is unreasonable. When it first kicked off I presumed it was like this.
However it became clear to me that the utter verve of the tree-felling cannot be excused, nor can the council's handling of the situation. My road for example had c30 healthy ash trees on it, and 16 have been felled. One of the city's few remaining Elms is being chopped down, and with it a colony of White-letter Hairstreaks, and trees planted for WW1 memorials are also coming down against residents' wishes.
It's been a very demoralising experience, with now very little to do but shout into the void, as felling continues in earnest and injunctions mean any direct action risks life-changing legal costs for ordinary people.
However the tree situation is merely a symptom of the undemocratic nature of secretive contracts with private companies, and the lack of accountability that have meant contractors have ignored methods to save trees with engineering solutions. Michael Gove can come up to Sheffield and frown sympathetically at trees all he likes, but as a Conservative Minister he's very unlikely to do anything at all about the underlying problem - shady contracts that put public assets in the hand of profit-hungry companies, purposefully designed to remove public accountability of works.
Too late for the trees, but I'm hoping the council are battered at the next local elections.