Human resentment to Vulcan is understandable. Star Trek's earth society (not ours) was making tremendous bounds in the late 20th and early 21st centuries until World War 3. The Eugenics Wars did not seem to slow them down, if anything, it helped. What the Vulcans did for earth was useful, from a band-aid standpoint in their post-war recovery, but it also stunted their growth. Not to mention the Vulcans deliberately withheld information about important local neighbors like the Klingons and Andorians, that Earth had a right to know about (how the Earth Cargo Service did not know about Klingons after decades of operation, I don't understand, but that's a thread for the future)
Vulcan interference was getting to the point, or past it, depending on your point of view, that it was no longer worth the gains.