In the name of Islam and when a dishonest Muslim is in Question I agree with you 100% .. as you may have heard of the even which took in the time of the Prophet SAW .. where a Jew and a Muslim came to the Prophet SAW regarding an issue over land .. the Prophet SAW gave his answer in light of Justice and what was right in favour of the jew as the Prophet SAw even for non muslims was saadiq ul ameen .. the muslim protested and didnt agree with the decision of the Prophet SAW.. so the muslim went for second option and went to ask Hazrat Umar RA and as we know Hazrat Umar is one of the most feared companion in history even till today his name lifes even in the lives of non muslims .. they asked for a decision and Hazrat umar too was in favour of the jew because thas what justice is .. the muslim weasnt happpy and Hazrat umar asked if your not happy then Go to the Prophet SAW.. as this point the muslim told that we already been to Prophet SAW.. and at this point .. the loyalty of the muslim was in question and hazrat umar went inside .. got his sword and took the muslims head off and told that if a muslim can not accept which the Prophet SAW has ordered or madde a decision about then he does not deserve to be alive.
^^ sorry for the long post but this was just an insight to your view on dishonest muslim where if things got to a bad point ..where wud your loyalty / decision be.