Conservatives and liberals are by nature essentially the same, as a system once set, is bound to have people against it.
A conservative system which has existed for some time will have liberal opposition, liberals coming to power , over a period of time would also tend to the same mean, thus getting turned into conservatives and the new liberals made up of conservatives (by definition supporters of the earlier system).
This balance is the reason of the policy flip-flops and the same party being on one end of policy at one point of time and the other end at another.
They are essentially the same. And those who recognize this and can rise above it to always do what is Objectively right are the only ones fit to be selected to rule.