Yes, clearly trick plays should be in sports. If someone is not able to stop me from doing certain type of disguising plays its not my job to quit using those plays its essentially the opponent's job to mentally prepare to stop me from making that play and in theory thwart it with their own attack. It is not only supposed to make you more skillful, but also mentally challenge you against others. If I were to play chess and I made a specific move to perhaps redirect someone's thoughts and priorities to somewhere else on the board as a distraction to perhaps win a piece or win the game. I have therefore beat him within the guidelines of the game. If you were to get rid of trick plays then you would therefore need to get rid of dekes, and fake passes in hockey all because those in theory trick plays and that is simply apart of the game of hockey and traditionally has lead to some crazy games.