Assuming you are asking about the safety of trigger locks as a means to prevent unauthorized users from firing a gun, there is no definitive answer. Some people argue that trigger locks are not very safe because they can be easily removed or defeated with a tool. Others argue that trigger locks are safer than not having any kind of locking mechanism at all because they at least offer some degree of protection. Ultimately, it is up to the individual gun owner to decide whether or not to use a trigger lock and how much security they feel comfortable with.