There seems to be an awful lot of people who are willing to compromise themselves for power, money, or both. They are the ones who would sell their mothers down the river to get ahead. They have no conscience, and will do whatever it takes to stay on top, whether it's illegal or not. That's the common philosophy of the Democrats. If they can't get what they want with the rules or laws that are in place, then they will change the rules, and ignore the laws to get to the required end.
I firmly believe, like most here on FR, that Obama and his minions went out of their way to surveil Trump and his associates during the campaign, looking for any dirt which would be beneficial to Hillary. After she lost, they simply continued gathering intelligence, in hopes of causing damage, and harm to the new Administration. They proved that when they leaked the info on Flynn. And they tried it with Sessions.
It never occurred to them they would get caught because it never occurred to them Hillary would lose.