There was a dozen cops with multiple weapons there...Why did they not just tase or pepper spray the homeowner holding the golf club?
Because some people are immune to pepper spray, and someone can still kill you with a golf club after you pepper spray them. Pepper spray isn’t actually that effective against a determined attacker. Members of the military and police are pepper sprayed in training and then forced to continue with their mission while under the effects. Tasers are bit more effective, but there are many people who don’t want those used either.