Precautionary Principle.
Likelihood of a problem x the cost of the problem happening = how much you should worry/care/act
When someone asks 'how sure you are' about something and you say 'really sure', unless you pull out a slide deck with numbers and graphs, that's an emotional estimate, and has no bearing on the precautionary principle. We naked apes get tripped up by this because we are used to dealing in social interactions, where your intuition works pretty well. Statistics, not so much.
You loan your friend your car when you're pretty sure that they won't wreck it, scratch it, make it smell like pork rinds. A business is not your friend. There's no social capital at play. Without that social capital you would never lend your car to a business. You don't owe them the benefit of the doubt nor do you reap a non-monetary benefit from doing so. Only when there is such a benefit (community building, networking, etc) would you even consider doing so.
I have certainly defended companies in forums because I felt they represented some part of a world I wanted to live in. That's my social capital in that case. The best way to predict the future is to create it, and I had a small part in that. I participated.
But in this case if you're wrong, instead of losing out on a toy, or a pillow that is always the exact right temperature, or a fridge that always has chocolate milk in it, you're going to lose money, face, and probably that world you hoped for. There's been enough shenanegans that the confirmation bias that kicks in if Tether is allowed to continue to grow and turns out to be a pyramid scheme has a real potential to have deleterious effects on the whole concept.
How willing are you to back Tether if it means there will never be a similar company that is actually legitimate? What are the objective odds of that outcome at this point? If you really want this world, you should be demanding transparency from everyone you support in this space at this point.