If you want to get someone thrown in prison, get their e-mail address, cellphone number, or other digital communications address. Then send them your choice of:
- Islamo-fascist propaganda (yes I still laugh when I see that term)
- Death threats and plotting against elected officials
- “Admissions” or diaries e.g. of sexual abuse
- Child pornography / sexual abuse imagery generally
and call the police.
Note that even child pornography is easy to obtain, given how many people have children. Note also that any attempts e.g. to educate children about sexual abuse, require people to provide accounts or examples of sexual abuse, to the public.
The only practical remedy is to accept that information practically is uncontrollable, and to repeal such possession crimes.