I see no reason to abstain JUST because every method has a fail rate.
If someone absolutely, positively cannot live with a pregnancy (i.e. it will pose a serious health risk, they absolutely cannot afford a child etc) then abstention (or sterilization) is a very good idea.
I see abortion as the same as going to the hospital to have an injury treated after, say, falling awkwardly in martial arts class and damaging a joint.
Hmm. I see it as way worse than a minor injury. You're killing a (potential) person, and that's never something you should contemplate unless there is a very, very good reason.
When the worst that can happen is going to an ER and getting a splint, you can take such risks without too much thought. When it involves ending a potential human life, a LOT more thought should go into taking those risks. (IMO of course.)
As an alternative scenario, let's say you were working as a laborer and are barely able to support your family. Any physical injury that made you unable to labor would result in your being unemployed. Your decision to risk injury in a martial arts class will likely be different in that case. Same risk of injury, but the results of that injury might be much worse (family evicted, hungry etc.)
It's better to train sanely in the first place, yes. It's better not to spar with someone who weighs over twice your weight (says the hypocrite, lol). But it's not wrong to go to the hospital to get seen to and I certainly wouldn't advise someone to simply give the sport up based on the fact that injuries can happen (analogous to abstinence). Because there are more important things in life than never being hurt.
Absolutely. But you have to make that decision based not just on the risk of going to the ER, but also what will happen after that. If you will lose your job due to an injury (or worse!) it would be wise to consider that BEFORE you get injured.
In my opinion you have the right to risk your own health, but you do not have the right to risk someone else's. And the risk you are taking is not always just the risk of going to the hospital.