Any form of punishment that is effective in maintaining law and order is justified. Do you agree?

The topic that I'm going to talk about today is on "Any form of punishment that is effective in maintaining law and order is justified. Do you agree?"
After watching the video in class last week, i realised that different countries have different way of punishing the criminals. Some of the ways seem ridiculous to me but they are effective for their country. I always thought that all the countries have the same form of punishments-which is fine, jail and serving community service. the video proves me wrong!
For example, in the rural town in Africa shown in the video clip, the villagers there practice "oil test" to determine whether the criminals are guilty. They believe that the boiling oil is able to scald the hand of the guilty one. Both the accused and the defendant are required to put their hand inside a pot of boiling oil. The one who is lying will get his hand burnt. I do not know why the people there will believe such "tricks" but somehow the practice has been there for decades and it seems effective in helping the village to maintain peace.
Another way of punishment seems more ridiculous to me. Criminals are required to carry a signboard indicating their crimes along the street. For example, a guy who ran over someone will have to carry a signboard stating "I ran over someone while i was drunk." The criminal will have to carry the signboard until they have finish serving their sentence. This form of punishment is known as public shaming. According to one of the prestigious judge there, this public shaming is effective in combating the crime rate which has plunged greatly after the introduction of public shaming.
The most ridiculous form of punishment is the one where the victim's families members are allowed to take revenge on the murderer by killing them. I totally disagree to this form of punishment as the vicious cycle will continue. No one would dare to step out of the house as they are constantly living in fear, fear of losing their lives.
I do not agree that any form of punishment that is effective in maintaining law and order is justified to a certain extent. Different country has different ways in dealing with their criminals, the punishment may be effective for their country but not to the other country. For example, if we introduce fine and jail in Africa, it may not work there as the villagers are superstitious. This is why the "oil test" is so effective for them. They believe that the god will help them to track down the criminals. Thus, we cannot say that any form of punishment that is effective in maintaining law and order is not justified. However, in the case of "revenge killing", it is definitely not justifiable no matter how effective it is. This form of punishment will only bring about more crimes.
Thus, it depends on what type of punishment a country practises before we draw a conclusion whether the punishment is justifiable.