You could have read the document before spewing toxic FUD about the kind of things mentally ill people supposedly do.
Here's the section that addresses your concern: "All persons, including those with disabilities, have a duty to do no harm. Legal systems based on the rule of law have criminal and other laws in place to deal with the breach of this obligation. Persons with disabilities are frequently denied equal protection under these laws by being diverted to a separate track of law, including through mental health laws. These laws and procedures commonly have a lower standard when it comes to human rights protection, particularly the right to due process and fair trial, and are incompatible with article 13 in conjunction with article 14 of the Convention."
Here's the section that addresses your concern: "All persons, including those with disabilities, have a duty to do no harm. Legal systems based on the rule of law have criminal and other laws in place to deal with the breach of this obligation. Persons with disabilities are frequently denied equal protection under these laws by being diverted to a separate track of law, including through mental health laws. These laws and procedures commonly have a lower standard when it comes to human rights protection, particularly the right to due process and fair trial, and are incompatible with article 13 in conjunction with article 14 of the Convention."