I only agree with this if the forum is properly moderated. We went through a long period of time where nothing was done with trolls and it made these threads almost unreadable. That’s how they win.
I think it is important to distinguish between "troll" and "FUDster", because the motivations behind trolling and spreading FUD are different. It is possible for someone to simultaneously be a troll and FUDster, but this is rare.
A "troll" has the goal of getting "Lulz", which is happiness from making someone upset. Trolls generally do this by taunting their targets and provoking them into angry outbursts. There is no motive other than to make someone emotionally unhinged for the fun of it.
A FUDster on the other hand, typically has financial motive. They could be a short seller who wants to depress the price of a particular stock by spreading false or misleading information about a company. They could be a long-term investor of company X, who is attacking company Y, a competitor of X, in the hopes of propping up company X's stock price. I recall that this often occurred during the chip wars of the late 90's and early 2000's, when proponents of Intel and AMD waged battles against each other on various message boards. A similar conflict erupted around the same time by people siding with either nVidia or AMD in the GPU markets. Combatants would spin benchmark results and spread FUD about everything from software/driver reliability to thermal problems.
A small set of people troll and spread FUD. In the AMD/nVidia conflict, it was common for people to taunt each other as "nVidiots" and "AMDroids".
Except that all your examples were contested but enough people didn't care about the truth to matter anyway, they believed what they wanted to in spite of the facts. I'll engage with the fudsters for a time until it becomes obvious they don't care about having rational debate. After that they are just a waste of time and further discussion just clogs the board. If no one responds they will most likely just go away since all they seem to want is an endless argument. My block list is small, of the six people on it three have been banned and one disappeared on their own.
The goal is not to convince the FUDsters, but to provide counterpoint for 3rd parties to read.
In 2004, nobody was going to convince "Swift Boat Veterans for Truth" that John Kerry wasn't the charlatan they claimed he was. However, the voters watching the ads on TV were the ones that needed convincing, and the lack of any meaningful response (at least initially) from the Kerry side proved fairly detrimental to Senator Kerry's presidential bid.
FUDsters don't want "endless argument". They want to plant unsubstantiated fear and doubt into the minds of a broad audience.