First of all, I did not use my moderator powers to delete the answer. I cast the 3rd delete vote, which any user with 2k+ reputation could have done. So I did not act in my capacity as a moderator here, I acted in the capacity of any regular high-reputation user.
Is this moderator just deleting things he disagrees with?
No, I do not. I voted to delete because I considered it a low-quality answer. It was just two lines, basically telling the reader to look up the Wikipedia article on epidemiology. I considered it a very unsatisfactory answer to a question which was well-researched and had a lot of specific examples and sub-questions asking for details.
A better version of that answer would have been how various governments applied findings from epidemiology to come to the decisions they made.
But just telling the reader to read the Wikipedia article on epidemiology if they want to understand complex government decisions is not just oversimplifying the problem, it is flat out rude.
To be fair, the question was edited a lot and I am not sure if the answer was posted on an earlier version of the question which was not nearly as good. But that does not matter. Community delete votes are an instrument of content curation which is used to remove inappropriate answers, regardless of why that is the case. And anyway, even the first version of the question would have deserved a better answer, in my opinion.
Does he have something against me, personally? (I don't see why he should, and he does sometimes do wholesale comment deletions when I haven't commented.) Or does he just like being obnoxious, and trying his best to destroy any interest this site might have for those of us who participate?
I do see why this moderator should indeed have a good reason to have something against you, considering that you just called him obnoxious and insinuated that he tries to destroy the site. But luckily for you this moderator is able to ignore personal abuse directed at himself. So this moderator will continue to do his job and judge content by itself, not by the person who wrote it.