'We trusted you'
No you didn't. Trust is a partnership. One that recognizes that humans are fallible and sees people work together to look out for each other for the betterment of the group.
Trust would have seen someone also take a look at the person and, upon realizing his background, point out "This person is not who you think he is." and the speaker realizing "Oh shit, you're right. We had better cancel these ceremonies."