You thinking it is worthwhile is all that should matter, just as a farmer thinking it's worthwhile to build a wall that lasts. Both instances are us giving meaning to self actualisation of individual drives be it preservation or propagation of genetic information or building something that will outlast you.
The fact that we've hit upon a certain arrangement of matter which yields consciousness and the ability to manipulate the matter around us is something which seems worth preservation.
I contain the information for how to give life to inert matter. I've done it three times now, and I think it's worthwhile.