A fist, rock, baton or any other weapon also gives police the ability to dole out punishment. All of these weapons are meant to allow the police the ability to take control of a situation, by force if necessary. The taser shouldn’t be singled out.
If it is found that the police are abusing their powers and are punishing the people they are supposed to protect, the those cops should be dealt with appropriately.
It appears to me that many cops seem to have forgotten that they are supposed to protect the people the are attempting to arrest. In some cases these are the people who need the most protection.
There is an ultra-fine line that has to be walked between using enough force and using too much force, if a cop is not capable of walking that line then they need to be replaced with someone who can.