> you can’t say some politician filled a country with immigrants from the third world.
You can absolutely say that, if it's true. As it stands, I don't know of country "filled with immigrants", so it's possible your edits are getting revoked for being incendiary hyperbole.
I'm also not aware of any politician described as racist in the first paragraph of their article. Can you indicate who you have in mind?
More realistically, controversies about racism and immigration are likely to be mentioned in a section of the given article, not in the first paragraph. That strikes me as a very fair way to handle it, which conveniently disarms accusations of bias against Wikipedia.