What if a lawyer knows their client is guilty, how should they proceed legally and ethically?

A lawyer who knows their client is guilty should still provide a strong legal defense while upholding ethical standards. This includes ensuring the client's rights are protected, maintaining confidentiality, and presenting the case in the best possible light within the bounds of the law. The lawyer should not fabricate evidence or knowingly deceive the court. Ultimately, the lawyer's duty is to advocate for their client within the legal system while adhering to ethical guidelines.