They didn't become public interest lawyers because of their poor professional skills. On the contrary, these public interest lawyers have more court experience, because they have fought many lawsuits and encountered many types of cases. They may be familiar with some court cases and may be able to fight for many rights and interests for you.
No matter what kind of crime a criminal suspect has committed, he has his own rights. They only need to be responsible for the crimes they have committed, and should not be responsible for other unnecessary things. Therefore, the court allows them to find defense lawyers for themselves, which is also a civilized embodiment of the law. Everyone is equal before the law. Even if he commits a crime, he should have certain rights. So lawyers will defend such people, and many people will say that lawyers don't care about others when defending others. But in front of lawyers, they don't talk about any feelings. For them, it is what they should do to fight for some legitimate rights and interests for their agents. So they will look at things more rationally, and they will think that a person should only bear the responsibility he should bear, and the rest are the responsibilities he should not bear, so he should not bear the responsibility.
I think this kind of thinking of lawyers is more rational. They don't kill others with a stick, but treat everyone rationally. Give everyone enough respect.