In regards to threads being posted in the Beginners & help section that are of negative connotation; The assumption is that newbies will be more prone to falling for these types of scams, and phishing attempts. Although, this isn't always the case, I guess there is some logic behind it. Therefore, depending on the actual information within the thread I would say it is OK depending on the content to be posted to the Beginners & help section. However, that's entirely depending on the perception of the moderator dealing with the report, because it could go both ways. My viewpoint is if the thread is quite obviously talking about basic concepts, and is aimed towards a newcomer to cryptocurrencies then it would likely be appropriate within that section.
I would say that guides to avoid scams, and tips about researching would be more appropriate than outright scam accusations. Scam accusations do not belong in Beginners & help, unless they're case studies included with a guide of some sort. As for complaints, and various other things it likely belongs in a different section e.g post about the forum belong in meta, a post about a exchange belongs in the exchange section, and a post about a user belongs in reputation most of the time.
If it is the first time someone uses a wallet, like Electrum, he has to rely on the results of a search engine because he is not familiar with the site. What is important is to not visit google ads and run the site through whois to get more info about it. If it was created recently, there is a big chance you are on a fake/phishing site. Once you visit the genuine site, bookmark and save the link, and visit it only from your bookmarks in the future.
There's also a big chance that misinformation has been spread on this forum whether it was intentional or not. Its very rarely that someone has completely understood a concept, and not only that be able to convey it to someone else accurately. Things like best ways to avoid phishing can be informative, but can also be biased based on their perception, and may even be incomplete. Unfortunately, in every walk of life we can only offer guidance its up to the person to digest that, improve upon it, and find their way.
The Merit-ICO-bounty discussion is rather complicated, more complicated than you'd think at first glance: did ICOs disappear because most of them were scams? Did they disappear because of the Merit system, which decreased the number of (newbie/jr) participants, leading to less "naive" supporters? If so, then how do we explain the new DeFi scams? Etc.
I believe quite a few countries have updated their laws to become more strict on ICOs, and how they can operate. This may or may not have had a significant contribution to the reduction of ICOs. As well as anything, overtime people will become more aware of bad businesses, and the telltale signs. For example, many years ago scam phone calls were very successful, and although they can still be successful today the general population are far more aware of this than 20 years ago.