Well violet protests are worse than peaceful protests, you want change, you ask nicely, not by using violence. Like for example, you’re doing homework and you don’t know a question, you ask the teacher nicely, not beat the teacher up and force the teacher for help.
Because it gives a better statement in favor of the fact that the books cannot be replaced for the opposing view in the counterclaim, the others only give statements in favor of the e-books.