I don't know what you mean by 'injustice' - it seems to be a proxy for 'I don't like it when trees die'. Is there more?
It's a bit awkwardly worded but unjust isn't the word I'd specifically choose, it was inherited from the OP so maybe their view of what "injustice" meant was different and I just hijacked it. Dunno. I interpreted is as an unjust allocation of resources that could have been put to more productive uses.
How did you determine this? Do you expect every single venture with forethought and planning to "succeed" (however you define that)?
Is it not prudent to assume that when the farmers made the decision to plant those trees, they did so with the best available information and "forethought" they had?