In an ideal world, yes.
But unfortunately these days people prefer to follow blindly their bias and people validating said bias instead of investing the time required to investigate by their own mean, with least biased sources.
I'd blame social medias that make everything quasi instantaneous, but it is just a component of a whole, not the only cause.

That’s no excuse to try to get a user’s account banned.

I'd say it is. They highlight the part of Steam's rules against harassment, and while that's always subject to interpretation, they feel that this counts, and I'm inclined to agree.

The steam group had like 1000 people now it has almost 200,000 after the whole debacle.

Before this group blew up, YouTube channels with hundreds of thousands of subscribers were already making their bullshit conspiracy theories. People try to paint this as Streisand, but that's ridiculous. The Streisand effect is trying to hide something, which you still seem convinced they're trying to do despite highlighting their clients on their web page and getting listings in the credits of the games they work on. What it looks like to me instead is that:

1. sensationalist YouTubers paint this company as the devil
2. this curator is made in response
3. it gets a natural, human reaction from the people targeted by this group
4. the YouTubers from step 1 use that reaction to mean whatever they want it to mean

In no way did I foresee a way that this group didn't continue on the same trajectory with or without Sweet Baby responding to its existence.

SomeOrdinaryGamer made a good video highlighting stupidity from both sides.

I've seen one video from SomeOrdinaryGamers, and it was too many, but he's cited in this article as perpetuating the bullshit conspiracy theories, so I'm good.