PhD thesis without acknowledgements During the process of writing my PhD thesis, I was close to falling out with my adviser, the advice I received from other staff at the lab (including the director) was unhelpful at best.
I have since made up with my adviser and have successfully defended the thesis.
I now have to publish my thesis.

The department says that one can include acknowledgements. All of the theses I have seen in my lab and in my department feature acknowledgements.
Due to this special situation,  I don't quite feel that acknowledgements are called for. Yes, my adviser helped during the first half of the project but then almost completely reverted his stance. In terms of contribution, it is my opinion that he comes out at 0%.

I do not want to address any of the issues in the acknowledgements. I do not think that this is the right place. Likewise, I do not feel like thanking any of the involved people.
Therefore, I would just leave out the acknowledgements completely.
In academia, is this considered worse than lukewarm acknowledgements?
Should I actually care about the acknowledgement, because others do?
A thesis is not a place to solve grudges. It is a professional document that is eternal. As such, it should be handled professionally and gracefully.

Still, I am having trouble why you do not want to have an acknowledgement section. Do you really believe you have done the entire PHD entirely yourself? Even if your advisor did not help enough, you had some funding right? And someone provided that. Should not he be included in the acknowledgement section? Someone also proofread your thesis. You probably also had co-authors in your papers. As you see, there are multiple people that contributed to your success. 

But on a more informal tone. Don't you wish to thank your family or significant other for the support? Or your PHD co-students? The people that you share your office with? You have finished a PHD and especially since it probably was a rocky one this a very good reason to celebrate. Do not spoil the moment with petty grudges. Do what you are required to do, be professional and move-on to better things.