I don't understand why it's so hard to understand that these people don't want to work in other industries, they want to make games. And thus it makes sense for them to organize and try to improve the industry they want to be in rather than having to flee to another industry, which currently happens all too often after severe burnout.

If it's so bad that many people are being forced out, then clearly it meets the bar of unionization being helpful. I'd rather start organizing than quit the industry I love, as the worst that could happen is I get fired (and potentially get a big payout on a subsequent lawsuit), and if it's so bad that the alternative is to leave anyway, it's the same result.