Why are professors able to get away with acting unprofessional?

Why is that professors are generally not held to the same stand of professionalism as those in the corporate world? When I say professionalism I am not referring to work ethic. I am referring to this in terms of appearance, attitude, interpersonal communication, etc.

I suppose one example of this is how some professors do not dress very professional (some do) and show up to teach a class looking like they rolled out of bed. However, what really seems to bother me is situations like these:

How to deal with an advisor who wants a "friendlier" relationship with me than I do?

My professor is rigging data and plagiarizing. What can I do?

My first authorship is being turned into co-first authorship, what can I do?

I understand that these are not exactly typical, but why is this allowed to exist at all in the academic world? In all three of these situations it seems that there is a complete lack of oversight of professors and their students can do very little to hold them accountable.

To give some context to my views, I work in the software industry. If my team lead was harassing me, I would tell my manager. He would then promptly tell the team lead to stop. If the team lead didn't, he would be fired (harassment lawsuits are very expensive, they would not hesitate to fire). It seems nearly impossible for a professor to be fired. I understand unprofessional behavior occurs in the corporate and academic world, but it seems like there are little consequences for professors, especially if they are "well respected in their field."