Never in the constitution is stated that the head of the government can be removed from office if the people feel he/she no longer has the nations best interests at hand. Therefore, Canada proves to be more democratic by allowing the people/representatives to strip the head of government from power if they no longer feel like the interests of the people are being fulfilled.
One could argue that that it is not mandatory for a Prime Minister and his cabinet to step down after they have lost the confidence of the House of Common, as it is a constitutional convention, and not a law. However, once the head of government loses the confidence of the lower house, it could potentially be challenging to get pass future legislations and bills in the house. Therefore, it is in the best interest of the Prime Minister and his cabinet to step