Recently, a client was so intimidated by an attorney that she almost dropped her own claim because the lawyer was so beligerent. After she explained her case, it was obvious the attorney was either profoundly ignorant of the law, or more likely, just bluffing. A small percentage of lawyers will bluff opponents by tough talk and threats. Many people are intimidated.
Lawyers are not.
Tough talking lawyers usually don't have the facts or the law or they lack both. The facts and the law beat clever arguments, loud protestations or any other means of exuding confidence. My confidence comes from knowing how the facts fit the law and how ordinary people like the jury will receive those facts.