Another reason why its easier to be conservative is that the system likes you to conform and that's not necessarily a malevolent force - its a natural phenomenon and tends towards stability. The problem is that the universe, left to its own devices, tends towards corruption and decay which means that all institutions end up being regressive and serving only themselves.

That means progressives are always fighting against the natural order even though the outcome is ultimately healthy and positive. Its one of Newtons laws. An object will maintain a constant velocity unless an external force is applied to it.