Pretty much, Signal is more dangerous for giving that false sense of privacy while you need to trust them just like other messaging apps, no thanks.
Definitely not true. Facebook literally censors private conversations. You simply can't send certain text strings to your friends. That is far more dangerous than relying on a third party that claims to be protecting your privacy. Especially since all signs point to them being honest.
To be clear, this is in private conversations. Not just posting publicly on Facebook or w/e.