Not the best approach, but we have to remember how it felt when we left, sometimes this may seem like a good idea for no other reason than self healing and misguided urge to shout what we now know, to non violently and legally retaliate.
Don't misunderstand me, it would not be a method I would use, but let's not be so judgmental, there is no right or wrong here, just opinion.
I must add that a friend of my family that I highly respected as a JW, spoke from the platform about his true views, I was told he spoke as an apostate in a meeting, I can't lie, that contributed to the many reasons that led me to one day leave. Seeing people outiside the assembly hall, people without horns or demonic eyes (mostly) helped re-humanise apostates for me.
So it isn't all bad, but not the best methods used.