Because it was Israel’s fault they were attacked on all sides in 1948. I guess this at that point one day old nation shouldn’t have worn such a short, Jewish skirt.
No, it’s based on safety. You can’t give them their own clothing back, because this would require you to check each and every item of clothing for weapons. They are being transported to a processing location, given clothing there. Temperatures were around 20° C (68° F) there when these videos and photos were taken, so it’s not like they were freezing.
This is a direct consequence of two things: Hamas not wearing uniforms in combat and their tendency to use suicide bombers. They are told to undress themselves before processing - they don’t stay that way.
How would any of the people criticizing this deal with a large group of fighting age men in a war zone?