Shaykh Salih Ali-Shaykh  on Political Demonstrations & the Principle: “The ends justify the means”
It is also not always the case that a servant (of Allah) may assume that since certain means are successful, he’s therefore allowed to take them. An example of this is political demonstrations. For example, if a large group of people comes and says, “If we stage a demonstration, this will pressure the leader and then consequently he will have to change and rectify the situation. The end justifies the means.” We say that this is completely false because the means in themselves are forbidden. These actions, even though the goal may be sincere and necessary, still the origin is impermissible. It is just like a person using a forbidden substance for some cure. Thus, there are many means and methods someone’s intellect may come up with, yet they may not be justified by the end result. So, this is for sure a false principle.
The means must be permissible in origin and then the ruling of the end result is applied to them; if the end result is allowable, the means are allowed. If it is obligatory, then the means are likewise.
 Salih Ali-Shaykh: One of the leading scholars of Saudi Arabia, a member of the Council of Senior Scholars, and the current minister of Islaamic Affairs in Saudi Arabia. (born 1362 Hijrah / 1941).
 This fatwa was taken from a book called “al-Fatawa al-Shar’iyyah fi al-Qadhaya Al-‘Asriyyah,” a collection of various rulings by Muhammad Ibn Fahd al-Husayn. Taken from the cassette: Fatawa al-‘Ulama fi Hukm al-Tafjirat wal-Muzaharat wal-Ightiyalat.