I understand prisoners need to be punished for their crimes and I do get that. I think solitary confinement can be used in certain cases of an inmate being extremely dangerous or something. The problem I think that is with solitary confinement is people are oftentimes in cells for 20+ hours a day. I think that this is inhumane and can cause serious psycological issues. I personally think It can be a form of torture. I think that there needs to be a way to get inmates to feel bad or sorry for what they did without locking them in a box for sometimes years on end.
For example when soldiers were fighting the Japanese in WW11, soldiers would thrown into solitary confinement as torture. Now a days people get treated more fairly but still in both cases prisoners often times go mad.