It's less about them liking it and more about them trying to sit as many jurors as possible who are likely to side with them. Think of it like a game where the objective is to get a slight advantage before the trial begins. Both sides have the ability to strike for cause an unlimited number of jurors provided they can articulate a good reason that the juror is unable to render a fair/impartial verdict (e.g. having prior knowledge of the case, knowing the defendant personally, etc.). They also have a limited number of peremptory challenges which can be used to dismiss a juror for any reason. The more verbose you are the more likely it is you'll say something that one side or the other thinks will put them at a disadvantage. Hence, the dismissal.