Be realistic: a 100yr old is due to die with or without me having a dirty cellphone.
as they say in KBP, "so what?"
Of course our actions all have some influence on how the Lord (can that be written?) judges us as a nation. But we have no idea on the exact cause and effect. For all we know he died b/c of ppl throwing rocks at cars on shabbos. But the point is that we don't know, and it doesn't benefit anyone for us to pretend like we know the Lord's 'mind'.
Unless this was a nevuah or ruach hakodesh, but that's a whole different story.
sometimes we don't know, but it is clear that "v'shav meacharecha" is harmful. Klal Yisroel is in a matzav of sakana, on an individual and general level, so many sick people, Hashem Yerachem. When we strengthen ourselves, we bring more protection from the shchina. That is what we know, as maaminim bnei maaminim.
Sometimes it is more clear, the cause and effect is obvious or hinted. I know one case that it was clear but will not go into details here. The point I think is that we need to raise our protection, bring the shchina closer and not chase it away, always and especially at such a critical time.
There are stories of the opposite happening, how someone exerted himself in shemiras einaim and saved a life. When it is obvious, it is obvious, like if at the same time etc.