I disagree. Many of the dogs in the JRT rescue would be PTS. Its often dumb owners not bad dogs. Of the dogs I have fostered, the majority had bite histories. Most just of the 'dent the skin' variety. Then one I have now drew blood on at least 2 occasions. I trust him the same amount as I trust my own dogs. They are dogs and if pushed will bite. Joey is not a bad dog, and as soon as posturing and threating stopped working for him, he settled down. One dog that had a bite history has been living with his new family for 2 years, and they say he is the sweetest dog ever. I think the circumstances need to be taken into account.
Personally, having a small child I would not adopt any dog with a known bite history, including JRTs from rescue. I'm sure some of them are really nice dogs that were pushed too far by idiots, but it would be irresponsible parenting for me to put my child and a dog that may or may not have a low threshold for pain or annoyance in that situation. Would you recommend any of those biters you fostered to families with small children? Because that's who very well could/would have adopted them if they were available through a shelter.