Why can't people who intentionally commit crimes be lawyers, Zhihu?

Because it is restricted by law. This is mainly due to the supreme dignity of the law.

The Lawyers Law clearly stipulates that a lawyer's license shall not be issued to those who have been criminally punished (except for negligent crimes). The specific provisions are as follows:

Article 7 An applicant shall not be issued a lawyer's practice certificate under any of the following circumstances:

(1) Having no or limited capacity for civil conduct;

(2) Having been subjected to criminal punishment, except for negligent crimes;

(3) Being expelled from public office or having his lawyer's practice certificate revoked.