"Does an adult individual who has repeatedly acted irresponsibly have equal value to an adult individual who has repeatedly acted responsibly. "
This is exactly why I hate your ideas, TC. This is it, exactly.
The answer to your question, my friend, is yes. All lives have equal value regardless of any intervening factor.
Now - in terms of actually answering your question: this is how it seems to work in practice:
-People you have never heard of, not even abstractly, are worth nothing at all.
-People you have heard of but never seen are worth almost nothing unless they are grouped into large masses. However even in the millions that matter little. A few people are good enough that they act on behalf of these people, but they are rare and even they are weakly motivated.
-People you have seen but do not know matter only slightly more - more people will act in these cases - seeing strangers being abused for instance, but many even most will still do nothing.
-People you have met but do not know well are within most people's "circle" of people they would do remotely anything for. They are at the periphery though, and your average person wouldn't do much more than give them a few dollars or a few minutes.
-People you know pretty well but are not close friends are the real "people" now. Most people are generally decent towards these people unless shit hits the fan, in which case they are often abandoned.
-True friends and some family you may do quite a lot for - there are people who would abandon their friends if it got deep, but they are fewer than for the preceding categories.
-Usually close friends and family or a love interest are the only ones, if you have anyone, that you will do anything for. Unfortunately though, we *ought* to treat everyone this way. We don't.
We can't, because we don't have the time or resources, but we *should* try. We don't try, as it stands.
Anyway. Out of sight out of mind is what really applies here. What also applies is this: the better you know them, the more your life would be negatively affected by their misfortune, thus, the more likely you are to care about misfortune befalling that person, since we are so selfish.