We need the translations because then we will rely only on ourselves. If something goes wrong, there is no need to hope that someone else has followed best practices thoroughly. Also, if in the future we decide to change the translation extension, we would be able to do that without any problem. (Not that this is likely - for now I am very pleased with GTranslate and almost managed to make it fit all our needs.)
This is not because you are somehow not trustworthy. On the opposite - it is because I don't trust anyone and anything.
I think this should be the default mode of thinking for everybody.