Sorry that should be woman, all 300lbs of her.
Cut it quickly and no one will notice!! Even a girl can do it....
We've lost a tree due to horses eating all round the bark. But not everyone is totally stupid ... if anyone ring-barked one of our trees deliberately, I would notice, that is for sure, and sue . One of our friends in the UK had a dispute with a neighbour about a tree shading their patio. When our friends went on holiday, the neighbours got someone to cut the tree- friends went to court and neighbour had to pay several thousand pounds to get a digger to make huge hole and replace with a large mature tree- which cost thousands itself.
Rules about trees are actually much more complicated in Uk than in CH, I can assure you.
The trees on public land were probably there when you bought the house, and you should have noticed them and expect them to grow taller - really. But you can try and talk to the Commune... but I can more or less hear their reply,, in short 'tough'.
BTW it is such a shame when people like Swissmorgs ask a question about a situation or other, and never come back to feed back about what finally happened.
Not to be dispassionate, but if they've sprouted a lot in the last few years, and that "lot" has not been a bother until now, would you consider a few more years, until the canopy has become sufficiently raised, which would then, perhaps, return to you an enhanced view of the lake?