The problem is that 'their' only objective is to undermine 'our' goal of having a balanced, honest discussion that arrives at some kind of valid, valuable truth. If a troll or discourse control agent can undermine that process, then they've 'won'.
And it's pretty easy to do. Actually, demanding sources is a great tool for undermining absolutely any discussion you like.
Someone claims something you don't like? Demand evidence/sources. If they can't produce them, you've won. If they can produce them, call into question the bias or veracity of the sources. You win again.
The basic tools of the troll trade are well known - derail, distract, discuss to death. Question motives and bias, use whataboutism, sling mud, lead a discussion into the long grass, debate every single point to death, ad hominem attacks, play the victim...
I think communities perhaps need to become more aware of those discussion patterns and vote according to whether something is using troll tools, rather than whether you agree/disagree.
Now that I think of it, an anonymous discussion is probably not protectable from well sponsored discourse control attempts.
Hobby researchers on Reddit have found out that they were able to push a story to the frontpage by spending a very low amount of money (about 200 USD if I remember correctly) for some puppet accounts and making sure that the very early moderation upvotes their story and downvotes critique. That gives us an idea how hard it is to counter concerted efforts of influencing discussions.
* How do I attach sources for my opinions or logical/moral arguments?
* I could spend an hour collating sources and writing a solid, reference based comment. A troll could destroy me in seconds with zero effort by claiming my sources are CIA funded or inherently biased.
* The internet has sources for anything you want to believe. I could easily google a bunch of authoritative looking sources confirming Flat Earth Theory, and then how will you refute them? Spend another hour discrediting those sources? And then what? I write a quick comment about how you’re obviously biased because of your media bubble.
Remember a troll doesn’t need to win the argument - he just needs to (a) cast enough shade so that an observer feels like maybe it’s subjective and neither viewpoint is correct, and (b) make you feel like it’s not worth the effort and hassle to argue with these morons.
If I (a troll) can write two x 1 minute comments that cause you to waste 2 hours of your time proving nothing, I’ve won.
[1] Edit: But they can't respond to everyone and thus accountability is forsaken in the name of progress ...? OK, that doesn't sound right. There is more to the lack of accountability. Which is perhaps just a lack of proper organisation, which, given the size of the world, might be understandable
I don't deny the benefits of information age, that is huge blessings for everyone. Probably it will take some time to reap the real benefits but I am afraid the cost is getting higher, as too much information/disinformation to filter out facts from fictions. And in most of the cases states and media agencies are part of that fiction and friction created in the society, take it China or US.