Ah common you know better than this. If you don’t believe the teaching explain why you don’t believe the teaching. Attacking the person putting voice to the teaching is bogus. I’ll put voice to the teaching, or someone else who has 10 kids will if that will make you take it more seriously and give it more credibility. Or go to the family section and hear from someone practicing NFP who is in a similar situation to your wife. Obviously the past is the past, but going forward you could at least learn about the teaching.
The Church’s solution in the case where pregnancy could cause serious health problems is to practice NFP conservatively and there are couples on this site that can attest to doing just that and under more extraneous circumstances than you have laid out. Practicing NFP as such is above 99% effective and puts complete control in the hands of the couple and not in the off chance that the procedure reverses itself. If the threat of death is really inevitable though, the only moral course of action would be to abstain. A 1 in 300 chance (risk of tubal ligation failing) of death going forward is very risky and is only slightly above the risk a soldier going into combat in Iraq would face assuming pregnancy brings a very real chance of death for the woman.
sciencedaily.com/releases/2007/02/070221065200.htm
The sympto-thermal method of NFP has been shown to be 99.4-99.6% effective when used correctly and it is not even one of the most reliable and all around methods that can be used for NFP. That study also included the women who accidentally had unprotected sex during their fertile period in the results out of the 900 women who participated so its results did not even depend on perfect use.
So using the sympto-thermal method your risk of pregnancy worst case scenario would be around 1 in 167 best case 1 in 250 and you would have the benefit of complete control over whether it worked or not. If you added a couple safe days when using this method though and either side of the cycle you could bump that ratio into the 99.9%+ range, and again like I said you have complete control over the process and are not relying on chance at all. Once you reach the 99.9% range you reach the point where your chance of pregnancy is 1 in 1000+.
Thus just being pragmatic it would seem to me that a woman who was at a serious serious risk to dying from pregnancy should practice a form of NFP conservatively as opposed to another method or complete abstinence.
The only plus I can see for getting a tubal ligation from the pragmatic sense and without even consulting the moral sense is that it is a one time thing where you do it and just accept the risk forever after that even if overall its a higher risk. This would purely be a decision made out of emotional concerns though and not based in reason. The sterilization option also means you don’t have to abstain for half of every month as well. This really does not mean less sex though, it just means you have less time to get the same amount of sex in