I live in Cornwall where the beavers have been released a few years now. People can go and see them at dusk. I have never ever heard of any beavers showing aggression.
They are doing great things for flood prevention in that particular valley.
The way we manage the countryside in this country isn't working OP. We can't simply try and crack down on it and expect it to submit. Did you see the programme last night about wild weather? They mentioned the 1952 Lynmouth Flood disaster. Victorian meddling on Exmoor, and attempts to try and impose control on those moors, plus the way they ignored the topography, resulted in the catastrophic flood and loss of life. This doesn't have anything to do with beavers particularly, but it's an example.
We need to work with the ecosystem not against it.
This is the part of the problem specifically the fact that the beavers were allegedly run out of this country and hunted to extinction. There is a reason our ancestors decided to remove them from the eco system and it is probably a good idea not to cause the same problem once again.
Surely they were hunted for their fur?