God is punishing the evil doers enough, so I'll do it. God isn't making the divine judgement clear enough, so I'll do it. Pharisees try to God's job for God, and drive people away from God in the bargain. Of course, preachers aren't the only ones. Every church has its share of Pharisees.
Pharisees are diligent and dedicated.
They have position in the institution. They accomplish a lot by their efforts and get to feeling proud of their accomplishments. They take too much credit, and usually they feel too much responsibility. They work hard, and it makes them furious when the slackers around them don't do their part. And then along comes some guy like Jesus who treats everybody the same and even lets the slackers off the hook.