Why isn’t the investigation of sexual offences being strengthened?

In Japan, investigations into voyeurism and CSAM are not actively pursued, and undercover investigations are non-existent. However, it seems that undercover operations will soon begin to address the issue of "dark part-time jobs." This refers to the growing problem of illegal job postings that involve criminal activities, including cases that have led to murder. Of course, I understand that murder cases are more serious and require greater investigative efforts. However, this has shown me that undercover investigations are possible in Japan. In that case, I believe investigations into voyeurism and CSAM should also be strengthened in the same way.

Why is there no effort to strengthen investigations into voyeurism and CSAM?

I often see people responding to posts by women speaking out about being victims of voyeurism with comments like, "Men get filmed too!" Yet these same people say, "Don’t spend money investigating voyeurism or groping—it’s a waste of taxpayers’ money." They’ve previously shown strong opposition to providing sanitary pads at evacuation shelters, so it seems they dislike any form of support for women that offers no benefit to men. But sexual harassment can happen to men too.

If they genuinely believed and were concerned that men could also be victims, they wouldn’t see spending money on investigations as a waste, since those investigations could potentially help protect them too.