Why is it forbidden for lawyers to provide false evidence?

Lawyers are prohibited from providing false evidence because it will hinder the people's court from hearing cases. Lawyers who provide false evidence in criminal proceedings constitute the crime of "defenders and agents ad litem destroying evidence, forging evidence and obstructing testimony" and should bear criminal responsibility. In criminal proceedings, witnesses and others who deliberately make false proofs, appraisals, records or translations of important cases with the intention of framing others or concealing criminal evidence shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention; If the circumstances are serious, they shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years.

Article 306 of the Criminal Law of People's Republic of China (PRC) * * * Defenders and agents ad litem are guilty of destroying evidence, forging evidence and obstructing testimony. In criminal proceedings, defenders and agents ad litem who destroy or falsify evidence, help the parties to destroy or falsify evidence, threaten or induce witnesses to change their testimony of facts or commit perjury shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention; If the circumstances are serious, they shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years. Witness testimony or other evidence provided, presented or quoted by defenders or agents ad litem is inaccurate, not intentionally forged, and does not belong to forged evidence.