I read somewhere Mossad has an estimated 20,000 "civilian volunteers" in this country. Only a small percentage of them do anything related to information gathering. Most want no part of "espionage", and merely provide support in relatively benign ways.
If an active agent needs a cover job,or quick cash, or a place to stay,or a temporary hideout,the network of volunteers will generally provide it.If a stakeout is involved,there are sometimes a few volunteers available for the task.
I don't consider their activity particularly "sinister",any more than the similar activities of other friendly countries.
This case went "over the line"-to the detriment of BOTH countries.(For example: Al-Jazeerah LOVES the Larry Franklin case !)
However, the bottom line for me is simply this: True friends don't "screw" their friends.....whether passing on top secrets entrusted to them under oath to another country...or the like.