The biggest problem with requiring walking or the umpires making judgements based on batsmen's reputations for walking or otherwise, is that people can be mistaken, and that includes any batsman who does or doesn't walk. If walking were required what would you expect a batsman to do if he weren't certain whether he hit the ball or not?

__________________
umeiV luphqhsesqe, all’ h luph umwn eiV caran genhsetai.