It's simple if you ask me. If you want to know a great leader, check how well criticism thrived under him/her. Let’s xray 2 Nigerian leaders randomly; Goodluck Jonathan and Muhammadu Buhari.
Jonathan’s number one critic, Nasir el Rufai. Buhari’s number one critic, Fela Anikulapo Kuti.
Response to criticism.
Buhari, silenced, jailed and tortured Kuti for months.
Jonathan forgave El Rufai when he was barred from holding public offices by the Senate during Yar’adua. He brought him back from exile and allowed him to walk free. He was only invited for questioning by the SSS when he made violent inciting statements. He went free after some hours and remains free to this moment. When El Rufai’s son died, Jonathan sent his condolence.
Choose wisely people. Fela Kuti remains our hero and whoever tried to silence him is our enemy. If you hold Mr. Kuti as a hero, Buhari has got to be your enemy. We know and uphold baba Kuti for his courageous criticism of dictators. We cannot hold him in high esteem and still hold those dictators in similar light.

Ride on my Mr President,it is people like you we need in this country not dictators with no forgiven spirit

Of all things to talk about at a time such as this, you chose this? "That thing" must be very infectious.