My Opinion And Comment In Regards To The Previous Examples
Most of the Ahkaam mentioned in the previous examples are based upon a Daleel Shar’iy from the Kitaab, the Sunnah or the Ijmaa’ As-Sahaabah.
So the permissibility of appointing a Khalifah when there is somebody who has greater merit is due to the conditions of the contraction of the Khilafah being met by him in the case where being a Mujtahid are not from amongst those conditions. The Sahaabah (rah) gave the Bai’ah to ‘Uthmaan Ibn ‘Affaan (ra) even though some of them viewed that ‘Ali Ibn Abi Taalib was better than him. None rebuked them for that and as such it represented an Ijmaa’ which represents a considered source from sources of the Islamic legislation.
As for banishing the people of Fasaad, then ‘Umar ibn Al-Khattaab (ra) banished Nasr Bin Al-Hajjaaj and no one rebuked him for that and as such it represents an Ijmaa’ of the Sahaabah which is a Daleel and not a Maslahah.
As for destroying or ruining that which is most likely to be believed to give strength to the enemy, then the Muslims destroyed the palm trees of Bani An-Nadeer. Allah Ta’Aalaa said:
Whatever you have cut down of [their] palm trees or left standing on their trunks - it was by permission of Allah and so He would disgrace the defiantly disobedient (Al-Hashr ).
In respect to the permission to tax the rich if the Bait ul-Maal doesn’t have the necessary sufficient funds to meet the expenditures which are obligatory upon the State, then this is taken from the Khalifah’s obligation to foster and take care of the affairs of the people and from the principle: