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Yes, I do believe that serious accusations require strong evidence. But, I also believe that strong evidence is a very slippery thing.
Logically speaking:
In this case strong evidence would be a "real" child porn picture, something that I believe non of the steemians, including the accuser, want to see or search for, in case they may be found guilty as well.
You said yourself that you haven't looked at all the pictures for that reason (or am I wrong?). In this case, you have no way of disproving the accusation as being false. Hence, attacking it on that level of lack of strong proof is invalid.
Considering the scenario that @titusfrost found strong evidence, if they shared that evidence with everyone else, they will be condemned for advertising for child porn and in this case @titusfrost will be as guilty as @iamgod in distibuting child porn.
The issue as I see it: We are all strangers from around the world. We all come here to make friends, make money, share our thoughts and share many other things. We trust each other by default (at least 50%) that every person is nice/innocent until proven otherwise.
It is inevitable that there will be evil people everywhere we go. Now the question. Do I trust my fellow steemian who is warning me about something that looks fishy (even if not completely illegal in someone's point of view)? or do I trust the steemian posting the fishy stuff?
I could do either of the following:
1- trust the accuser 100%
2- distrust the accuser 100%
3-trust the accuser 70% and be aware of things in case they turned to be incorrect.

In either case, it is only smart to keep in mind that the accusation are real and be aware to act fast if the fire started spreading.

Finally, many people are abused around the world but have no ability/power to speak up or ask for protection (for some reason or another). Does that mean they weren't wronged? Does that mean the abuser haven't done anything wrong? Not at all. Yet, the abuser lives free while the abused pay for the pain and humiliation for the rest of their life (psychologically at least)

One has to prove that the other party is guilty, one doesn't have to prove that he is innocent. We haven't seen yet any proof of the accusation, it seems like normal porn and photos from metart. The titles are just clickbait like the ones you can find on any porn website. And no the community wont go over hundreds of porn posts to find out if it's true or not, if you have a proof go to the local autorities to report it.

Proof can work either way, for guilt and for innocence.

Those who are innocent can prove their good intention to other steemians and build trust and reputation, like many others are doing.

I mentioned that I know many of the followers and that I dont think they are the type of people who will endorse pedophilia or porn on steemit at least.