Most of them should be fine to air. Tv today and back then is very diffrent now. Almost everything has some type of gun shooting at others. I seen a lot of the banned episodes before they were actually banned like the one when Team Rocket catches Santa.
But the Porygon one, I don't think it should be aired. I was watching clips in slow motion from it and it was hurting my eyes. Nothing else has ever done that to me. I was too afraid to watch the part that actually sent 600 kids to the hospital,even though it was like 100 times slower than the normal speed.