I'm aware of that from playing other MMORPGs. All MMORPGs have things to be negative about. The difference is always that the happy players just focus on the aspects they enjoy and that make them happy, rather than expecting everything to be perfect.
It's a bit like life. Most people would say that life is not perfect and they just deal with their circumstances - such as living in a bad neighborhood, high taxes, high bills, laws they don't agree with, products they need but that are badly designed and annoying. But many of those people just focus on the aspects of it that they do like and that make them happy, such as their friends, because the alternative is perpetual depression.
For me personally, it's about providing scrutiny of the complaints. Conspiracy theories are a common thing these days, but if those conspiracy theorists tried to disprove their own conspiracy theories they often would. For example, the 5g thing is ridiculous. On the other hand, the Wuhan lab explanation had merit. Scrutiny of the scrutiny is important.Or you need to just stop complaining about people complaining
Instead, it is typical for humans to live in echo chambers - communities of people who share the exact same view. They perpetuate eachother's view, such that it becomes the normal and accepted viewpoint. It's made worse by websites like Facebook where they simply remove friends that don't see things the same way, or join groups where everyone thinks the same thing.
So you see, people of opposing views posting on these forums is good. Seeing things from an alternative perspective can make you consider an alternative way to perceive it that you hadn't considered because of being so deep in this echo chamber.
The problem is really when none of the posts are constructive, and don't have any depth whatsoever. Whether someone is being positive or negative, if the post lacks depth and doesn't explain why, how, bullet point issues, reasons and examples, it doesn't contribute anything really.