There is perception, not unwarranted, that the authorities are more interested in going after those who expose wrongdoings, rather than those who actually committed the offence. In other words, the authorities are more likely to take action against whistleblowers, rather than wrongdoers.
Recently, someone cheekily tweeted a scenario where a person makes a report to a police officer about money stolen from a mosque. When asked what proof he had, the CCTV footage of the perpetrator was shown. The officer’s response was to investigate how the CCTV was obtained, ignoring the actual crime.