Many disagreements turn into ugly fights because people feel pressure to get a decision on a matter. It happens at work and home. Each party starts hitting harder and harder, or in reaction, run further and further away from any interaction at all. However, if both parties give each other permission to step on each other’s proverbial toes and not worry about the outcome, a lot more is going to get aired, and usually that leads to healthier decisions even in the absence of a full agreement.
It actually is fun in many cases, as long as the rules are clear – though not usually pain free. The point is to avoid injury.
Sometimes the instructions on where someone has permission to “hit” you ought to be pretty specific. A married couple cleaning out their cupboard may agree to take the gloves off when talking about what dishware to throw away but not the silverware.