The flip side to coercion is that there are many times that some form of restraint is necessary. The main purpose of restraint techniques is to make an intractable horse safe to work around when you are attempting to do something to it that it doesn't like. Restraint techniques are necessary for the safety of both the people working on horses and the horses themselves. For horses where re-training and coercion are appropriate, there are numerous books published by experts in the field of equine behavior and training that can be of benefit. The choice of restraint technique is a matter of personal preference, experience, the individual horse, and whatever is available.
Some horses resent the initial application of certain restraint devices more than other horses.
Obviously, if World War III erupts over the application of a twitch, the whole process might be self-defeating and actually could be more dangerous than no restraint at all. Remember, all horses are individuals and, therefore, are different. I have worked on several horses which went crazy if a traditional wooden handle twitch was even in sight, but a hand-employed skin twitch or a hand grab on the ear was more than adequate restraint. Conversely, there are many horses that go bonkers if their ears are even looked at, but are perfectly amenable to the application of a traditional lip twitch. You might need to experiment with your horses to see what works the best and causes the least upset.