I don't think it is. If the corporation is going to be donating to groups and lobbying politicians in support of certain policies, are employees who are strongly against those policies supposed to just shut up, ignore it, and do their work?

I'm lucky that I'm in a place financially and career-wise that I can just quit and find a new job if I disagree with my company's politics, but many others don't have that luxury. Their choices are either to talk about it and try to get their company to change, or feel awful keeping quiet.