to have mind made up
夜盗は常に夜盗だと 思い込み...
It would baffle the police.
夜盗は常に夜盗だと 思い込み... ピストル強盗するとは 考えない
They always expected burglars to remain burglars... not go in for stickups.
- 思い込ませる
You got to sell it.