The gemara in Kesuvos says “הכל בידי שמים חוץ מצינים פחים ” – “Everything is from Shomayim except for cold sickness and heat sickness”. The מפורשים explain that it means that if you slept with a window open on a freezing night and wake up with pneumonia, the fault is on you.
Tehillim rallies are nice, but an ounce prevention combined with a pinch of סכל a dash of השתדלות would go a lot further to help our situation.