Handcuffing is not as easy as you think, especially if the person is large, belligerent, mentally ill, or under the influence of narcotics. I know this from experience. TASERs are meant to prevent the use of unnecessary force to subdue a subject in order to effect a lawful arrest. The safety of the officers is paramount over that of a perpetrator, especially when one of the officers sustains a head injury. My recommendation, don’t “Monday Quarterback” the incident...you weren’t there.