Also, put yourself in the following scenario: you are flying to E.Y. for about $1200. Your rav paskens that it is assur to sit next to a mam (I don’t know why you use the terms “believe” and “religious obligation” instead of “psak halacha”). You have a choice: rely in working it out amicably if you are placed next to a man as can be done 99% of the time, or pay an extra $1200 (every time you fly). What would you do?
DaasYochid – because you have not proven that it is an absolute requirement. So far, I have only seen maybes, Lechatchilas, and try-tos.
But let’s make your argument real.
You are going to take Lulav. 99.99% of the time it will be OK and you will remember not to carry your lulav in the Reshus HaRabim on Shabbos. 0.01% of the time you may forget. What would you do?
In the case of Lulav, the upside (a mitzva vs. stam Kesef) is much greater, and the downside (Toeh B’dvar Mitzva on Shabbos vs. an Issur Arayos, which is Yehareg V’Al Yaavor) is much less severe. What would you do?