Not having tenure can turn many academics into cowards. They are actively advised to keep their heads down, not make waves... until they get tenure.
Which raises the question:
Once you get tenure, do you make waves?
There are a lot of people who would abolish tenure in a heartbeat. It would be easier to get rid of ineffective teachers and researchers, the argument goes.
If you are an academic who thinks that tenure is important in protecting against capricious firings and retributions, and that tenure is important in allowing faculty to make long-term plans... have you used your tenure lately?
Have you taken an unpopular position? Took the lead on a cause to make something better?
Have you started a project that needs more security that recurring one-year contracts?
Use it or lose it, as the saying goes.