My gut feeling is that if you need the power to monitor everyone's financial transactions in order to catch those who hurt children, you're unqualified for the job.
Some of the same folks shouting "Life doesn't owe you anything" at college leftists expect everyone to bend over and spread their cheeks in order to make their criminal investigations easier.
Stop believing you need to act like tyrants in order to catch monsters. Get off your lazy ass and do your job.