The thing about SA it can be used as a precursor to an explosive device as you mentioned. Hence the restrictions placed upon it in the sad world we have been living in over the past few decades with both domestic and international terrorism. So in some countries SA is a very reportable substance if someone outside of manufacturing/industrial or equivalent purchases it, i.e Joe/Josephine Public. Looking at the availability in my country (UK), there ae a few labs that sell SA, I have not gone through the whole process to see if they deliver to a private address using a personal credit card, but one site did state clearly that a police check would happen prior to delivery.
One thing I do not like about SA is the potential danger it poses to those who find your body through the Hydrazoic acid it produces when it makes contact with your stomach acids. If you vomit, this will come up. If you have a hero who tries mouth to mouth resuscitation then they will be hurt.
Yes, I know what you're talking about as far as the acid production. However, there are three points which should be seriously considered. First, vomiting only happens in a minority of cases. Second, no professional paramedic uses direct lips-to-lips contact anymore, they use a mask. And third, in a major change of position, the American Heart Association and most other organizations now say to skip the mouth-to-mouth breathing and just press on the chest, in other words hands-only CPR.
You're certainly correct that this is an issue with SA that can't be totally ignored, but personally, it's not a game-breaker. I'm more concerned with the difficulty of obtaining it, and the damage it would do to
me in case of an unsuccessful attempt!