There are several reasons for towing when sea kayaking:
In an emergency situation the best towing method is the one that gets the paddler away from the source of danger quickly.
About Towing Single line tow Assisted tow 'V' Tow Safety Common Mistakes
On Club paddles, towing is a team activity. The trip leader normally coordinates who will tow and what type of tow is required, and assigns other roles within the group.