What people don't realize is that before tasers the method of making someone comply (when fighting handcuffs being put on) was batons or actual punches. Yes tasers may cause health issues in 0.001% of uses but batons and punches would cause many more.
Also, a lot of officers don't even carry mace anymore as it generally sucks for everyone when its employed. They are going to get it on them via wind or handling the suspect and it impacts their ability to function.