Misplace trust - Idioms by The Free Dictionary
misplace one's trust (in someone)
to put trust in the wrong person; to put trust in someone who does not deserve it. The writer misplaced his trust in his editor. The voters misplaced their trust in the corrupt politician.
References in periodicals archive
Like almost all types of cybercrime exploits, the success of targeted attacks relies on technical holes and the all-too human tendency to misplace trust
Trust Exploitation: Most cybercrime exploits hinge not only on technology but also on the all-too-human tendency to misplace trust