Removing the Like button means you can't be Ratio'd anymore, even compared to the comments of your detractors. That means vile, unpopular opinions will no longer be identifiable by the lack of likes. They get to stand on equal footing with popular opinions, with the average person none the wiser. Also, advertisements take one more step to being indistinguishable from organic posts.
Homogenizing content on Twitter supports Musk's two two main allies (or people he wishes were his ally): advertisers and fascists.