North Korea President has executed an architect over a building that collapsed annd killed about 500... what do you think of this verdict?

This is not the first time Kim Jong-un is executing people. Infact, last year, his uncle was a victim. He reportedly excited him for alleged treason and wiped out all his line, even down to kids.. 

So when The 23-storey building collapsed killing more than 500 people, including housed high-ranking intelligence and police officials. Kim was said to have suffered sleepless nights and passed this literally deadly verdict attributing this collapse to poor workmanship. 

The North Korean leader, Kim Jong-un rounded up the engineers and architects behind the deadly collapse of a North Korean apartment block in the capital, Pyongyang and executed them by firing squad. A military official who was in charge of the project was sent to a prison camp.

I think his verdict was pretty harsh... These are my thoughts, people think otherwise. 

What do you think??