IT'S DIRTY BUT IMPORTANT

The body is made in such a way that it has many functions.  Some functions we may despise, but we cannot disregard.They are very much a part of our daily life. Every day without fail we respond to them, if they stop working or over work then we get disturbed.  I am referring to the process  and function of evacuation.

Similarly in this world there are some important jobs that need to be done.
We may  not like these jobs  may want to avoid them but we cannot. I am referring to  politics, and politicans. We may hate them but we need them. These positions cannot remain vacant, if good people do not occupy the positions then some one else shall occupy the position.

Unfortunately the most impact creating occupation  in society is currently occupied by unwanted people. The good people chose to work for multinationals thinking there is no corruption there  and we  can do our work work honestly in multi nationals. This  is exactly how Drona and Bhisma worked honestly but for  the most crooked people.
Dharma is very subtle. Our personal honesty to collective dishonesty is as bad as personal dishonesty.

Therefore interestingly all the royal kings  are the ones who heard all scriptures.
In fact all major books were spoken to politicians. Bhagavad gita was spoken to Arjuna on the battlefield, and Bhagavata was spoken to Pariksita another king. Such kings are Rajarshi, they are saints among the kings.
However their saintliness is not at the cost of not punishing the culprit, its not about not taking tough decisions.Their toughness is  displayed in their indifference towards the culprit, who may even be known to them or related to them.

Arjuna had to be tough, in giving punishment to Bhisma, and Drona, not because they were his  personal enemies, rather on the  personal front they were two people whom Arjuna would do anything  to please . Instead he shot at them terminated them, because dharma was asking him to take a call to stop their autrocities.

Good for bad or bad for good, so that good prevails.