I don't think this is unethical, and while it isn't work that I've done I wouldn't have an objection to doing it.
Facebook is able to provide their service free to users because we "pay with our data", and stripping the tracking parameters was one method people used to get the service without "paying". Facebook would prefer to offer this is a package deal, where you can only have the service if you accept the tracking. I don't think it is unethical to strip the parameters, but I also don't think Facebook has any obligation to make that easy.
As an analogy, I think it's fine for users to run ad blocking software, but I also think it's fine for sites to attempt to only show content to users who view the ads.
Facebook is able to provide their service free to users because we "pay with our data", and stripping the tracking parameters was one method people used to get the service without "paying". Facebook would prefer to offer this is a package deal, where you can only have the service if you accept the tracking. I don't think it is unethical to strip the parameters, but I also don't think Facebook has any obligation to make that easy.
As an analogy, I think it's fine for users to run ad blocking software, but I also think it's fine for sites to attempt to only show content to users who view the ads.