If you are aware of the risks and want to take the chance, then you can, but knowing the consequences and how they may act (usually out of legal obligation and liability reasons), most people wouldn't wish to mention SaSu. In short, if a mental health professional (a therapist is one of them) believes, suspects, or has reason/probable cause to think that someone may be in danger, they will take action, which may result in additional scrutiny, a safety plan, or worst of all, being locked up against one's will. Given how the law mandates certain professions and authority to act if they suspect someone may be at risk of harm to themselves or others, especially in today's climate, your therapist may act under "better safe than sorry", which may result in unwanted consequences.