sorry, but I have no pity for these kind of people.
they clearly know what they're getting themselves into. they know what is right, what is wrong, and they still choose to do it. it doesn't matter the reasons why they did this. there could be millions of reasons why, it's still up to them to get themselves involved. like the quote, "others may have influenced you, but you are responsible for who you become."
the only time I would feel pity for them was if someone had secretly put it in their bags and they really didn't know, then yes, I would side with them. but if they were 100% conscious and knew what they were doing, nope!