Deere seems to have bad relations with their employees, customers, and regulatory bodies.
The shareholders should remove the board of directors.
https://www.desmoinesregister.com/story/money/business/2021/...
Firing a board is generally risky, and the shareholders probably haven't fired them because even though the board has, almost objectively, not been good - firing them is likely even worse for the stock short term, and there aren't a lot of long-term, active investors left in the world.
If an action that hurts the stock short-term but will help int he long-term needs to be performed why would you as an investor enact it or even stay for the ride?
You are better off either opposing it or selling your stock and then waiting to see if someone will enact the changes, then you have the "insider" information to know that the short-term stock drop was a good thing for the long-term and rebuy the shares cheaper.
You might drive down the share price if earnings go down, but that's not necessarily the case if the long-term value is clear. An example would be any company reinvesting earnings in a new factory.