Compliant-Ahmedism should be allowed to be practiced in peace. The Ahmedis do however need to stop calling themselves Muslim if they believe that Qadiyan was a messiah/prophet. They ought to respect the religion of Islam and its teachings. Muslim by definition means a follower of the faith brought by Prophet Mohammed pbuh. If one wants to claim prophethood, there is no body stopping them from doing so, provided it doesn't come at the expense of any other religion. Call yourself a messiah, but make your own religion. Don't destroy somebody elses.
Objectively speaking, Guru Nanak was inspired by Islam and did the right thing by creating a new breed of religion i.e. Sikhism, which is a mesh of Islam, Hinduism and Punjabi culture. Abdul Baha'i went down that path as well. The Ahmedis need to do the same. One can't simply seek to discredit and rewrite 1400 years of Islamic literature. That is being selfish and asking for trouble.
The Lahori sect of the Ahmedis has it right, Qadiyan was a spiritual reformer, like many Muslim saints. He did not seek to destroy Islamic teachings but simply sought to guide people back to them.
Sunnis and Shiites will never accept the sullied brand of Islam which mainstream Qadiyanis are attempting to pitch. The Ahmedis need to be sensitive to Muslim sentiment.
Having said all this, being a Qadiyani doesn't mean one can't be a patriot. My avatar ought to say it all.