The point is that his cause was not unjust and the philosophical precepts attributed to him are mostly false. I didn’t know you’re taking issue with the entire American transcendental movement. Do you also dislike Emerson, Margaret Fuller and Bronson Alcott? Hawthorne was also tangentially involved.
The point is that you implied that an individual should not be disrespected for their personal choice.
However, Thoreau was a public figure and influential so according to your standard one should therefore be allowed to view him negatively (which I do).