Politics means the taking care of the affairs of the Ummah internally and externally; it is performed by the State and the Ummah. The State handles this taking care (of the Ummah's affairs) practically, and the Ummah accounts the State (re it's performance).
Ever since the Khilafah "Caliphate" was destroyed and Kufr political systems were applied in the Islamic lands, Islam ceased to be political. In it's place came Western political thought established upon the Capitalist doctrine, a doctrine that detaches religion from life. What must be clearly understood by the Muslim Ummah is that taking care of the affairs by Islam cannot happen without the Khilafah "Caliphate" and that separating political Islam from life and from the deen means eradicating Islam, it's systems and rules and the wiping out of the Ummah, her values, civilisation and message.
The capitalist states adopt the doctrine of detaching the deen from life and politics, and they work actively to spread this doctrine and establish it's rules upon the Muslim Ummah. They also work to mislead the Ummah and convince her that politics and the deen do not mix, and that politics means realism and being content with the current situation and the impossibility of changing it. All this is to ensure that the Ummah remains under the yoke of the states of Kufr, oppression and tyranny, and unable to envisage the path for revival. In addition they work to alienate Muslims from the Islamic political groups and from involvement in politics. This is because the Kufr states know that there is no way to strike against the West's political thoughts and rules except by political action and by being involved in politics on the basis of Islam.