In my opinion you cannot compare the Catholic religion to that of the JW religion because the Catholics do not shun members who decide to stop attending church. Also the JW's do not have a "faith community" in any real sense. They belong to a legalistic cult of mainstream chrisitianity that is more concerned with the members obeying thier rules than with fostering community within its ranks.
So NO I would not feel the same way about this if it were a mentally challenged jw kid. That is my opinion as a mainstream christian who also grew up in the Catholic church and was a JW for a decade. I am viewing this from my experience on all sides of the issue. While You are also entitled to your opinions you must know you and I will never agree on this one.
Lil,
I'm sure you'll agree with me that JWs mis-use the rite of baptism - and they do use it as an inclusionary tool to get individuals to join or "belong" to the cult group. The mind-control tactics play on the sense of belonging that all individuals want - the sense of belonging that is an integral part of the human experience. I think you'll also agree with me that it is a bait-and-switch tactic whereby individuals who become baptized are thereby enslaved / shackled to the group and there is no way out unless they are prepared for the social and emotional ramifications that ensue with shunning.
To me, it is an issue of the capacity to consent. Legally speaking, some mentally challenged persons do not have the capacity to consent, because they do not comprehend the implied contracts involved in things like taking out a loan at the bank, engaging in sexual activity, and committing to a belief system (to name a few) - all things whereby the person would be at high risk of being taken advantage of by persons who do not have their best interests at heart, but who are seeking their own advantage over someone who will never be their equal. That's why I feel it is unethical, even in cases where the individual wishes to (or is encouraged by their relatives to) submit to these activities.
There's nothing wrong with us agreeing to disagree on the matter.