As a percentage, there aren't that many prison escapes, and many of those are the result of prison staff making mistakes, and simply being understaffed. Prison guards don't earn that much money, it's a high-risk job, and they have a high staff turnover rate. Those things would be relatively easily solved by increasing staff numbers and salaries. Do that, and I bet you'll see fewer prisoners escaping.
That aside, the chance of a prisoner escaping should not be a factor in deciding whether to put one of them to death. It's a different problem entirely.
Should the results of poor staffing be killing prisoners? No.
But it's there, happened, still happening and will keep happening, regardless to any analysis or excuses we could come with. We face facts and should act according to facts.
Prisoners escaping, whither it is a different problem, it still risks (actually already caused) more innocent dying while execution could have effectively stopped the chain of murder way long ago. Tragedies like the ones in the links I gave above could have stopped effectively. We need to consider other people and their priorities.
In the end completely removing death sentence as an option will result in what we don't want to happen, not that it isn't really already happening.
As I said before, killing people is wrong, across the board, regardless of what said person may or may not have done
But you also said before that self defense is an exception. What made you say that before and forget it now means that there could be other exceptions you're not aware of. That is why I say death sentence is not an absolute necessity, but should be there as an option as circumstances call for:
Whatever motivations there are, you're just as dead either way, and that is my point. It's not ok to kill someone, whichever reasons you have for doing so, especially if there are other options available. (self-defence aside)
In normal cases I do agree with you tho.