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Why do we HAVE TO trust them! (?)
Well you don't really have to trust anything and you're absolutely correct to be wary of them. I personally think they're bad news unless done correctly, which they aren't. I was just pointing out that they exist because there's demand for them.
With some effort I can understand the demand for one of them, but why there are so many of them and why even more are going to be issued? Does this mean that previously issued "stable" coins need improvement? Or, maybe, it means that older coins have compromised their reputation already and people expect that new ones will be more trusted?
Actually I'm not against those coins in general, because I think they can be a stepping stone towards wider crypto adoption. Most people can't trust something as unstable as current cryptocurrencies, so maybe for many of them "stable" coins can become first crypto they are really not afraid to buy. I just don't want those coins to fail people's expectations because if that happens, they will abandon crypto market for a very long time, if not forever.