Should we not spend time making others successful in the first part of our careers? And should we stop having ambitions of our own after that?
The tenure system encourages a terrible before-and-after mentality. The only way to do it right is to live our values all along.
But I do think academia's structure tempts people into an odd division between "what I have to do now" and "what I get to do eventually" that's deeply destructive.
☛ If there's something you really want to do, don't wait to do it until you get tenure.