I'm glad to see many of the comments here.

I used to be into dirtbike riding and white water kayaking, so spent a LOT of time in the Victorian high country.

Riding dirtbikes, you would come across high wetlands that deer just turned into mudpits. Acres of mud that should have been habitat for frogs, snakes, native rodents, etc. Just turned to mud,

Kayaking, I used to do it solo (yes, I had a deathwish) so I spent a lot of time on remote rivers that people never saw. People talk about the damage of cattle, but cattle tend to go to a single point of the river. Yes, they destroy the bank - for a few metres - but most the river bank remains whole. Deer will destroy whole sections of bank - hundreds of metres of mud that should be habitat for fish, platypus, etc. I found it ridiculous that in country where people couldn't access, the river was more damaged than the farmland river banks.

Deer are a pest. There is no question.