Because <span>its a system of </span>democratic governance<span> of a </span>state<span> where the </span>executive branch<span> derives its democratic legitimacy from the </span>legislature<span> (</span>parliament<span>) and is also held accountable to that legislature. In a parliamentary system, the </span>head of state<span> is normally a different person from the </span>head of government<span>. This is in contrast to a </span>presidential system<span> in a democracy, where the head of state often is also the head of government, and most importantly, the executive branch does not derive its democratic legitimacy from the legislature.
This is a type of cognitive bias and it involves people justifying their standpoint or beliefs about a certain topic by looking out for informations that strengthens such beliefs or bias. For example a Christian believer would always defend his religion and show some level of bias to other religions.
