Well, it doesn’t really happen. There are basically no cases of it happening and even in the original incident there was no “syndrome” or complex mental trauma that made the captives sympathise with their captors.

They just had sympathy for them because they (the captors and hostages) were not terrible people apparently.

Same thing is likely happening here. These people clearly look healthy and well fed so no torture or neglect took place and they finally had the “opportunity” to see the palestinians as humans instead of targets