If an officer goes into the home and finds a child being molested, then sadly yes he should leave. We have rules and laws for a reason. The exception is never good and almost always terrible. But if you start carving out exceptions here and there, then soon you no longer have the rule of law. What you get is a rule by situation and that is never going to end well. That will lead to a tyranny or dictatorship and a situation where we fear our government.
It really doesn't matter if people who are secretive are the ones up to no good. It needs to be proved the right way. Breaking the rules is what the criminals do, not what the cops should be doing.