Taser usage on human : Appropriate or Inappropriate ?

I had to ask this question when I saw a news online, it is about a police in Dundee that uses a taser to stop a 57 year old man from killing himself with a knife. The man has threatened to use the knife to take his oown life, the police had to use the taser just to save the man's life. Read the statement below…

"The initial officers who attended were informed by the male, through the closed door of his flat, that he had taken an overdose.

"When attempts to persuade him to allow them into the flat failed, the officers asked for back-up from a unit carrying ‘method of entry’ equipment. The nearest such unit was an armed response vehicle.

"Although armed officers would not normally be used to gain entry in this way, it was concluded that this was a life-threatening situation that warranted their use.

"On forcing entry to the flat, the four authorised firearms officers found that he had placed a knife to his neck. The officers attempted to negotiate with him but when it became clear that he was pressing the blade further into his neck, one officer discharged his Taser.

"This incapacitated him, enabling officers to remove the knife from him. He suffered no injuries as a result of the discharge.

"The male was later charged with an offence of breach of the peace."

The commissioner found that use of the Taser was "proportionate and justified" because it allowed officers to prevent the man from inflicting a "potentially serious injury on himself".