It’s slightly rude to suggest that I have issues with my mental health because I watch nature documentaries.
It does not make me miserable to think of these things, it’s just life. Life is struggle for the majority of living things with brief intermissions of contentedness- if you think otherwise you’re only kidding yourself (although it doesn’t harm anyone by living that delusion.)
David Attenborough pulls few punches when showing how brutal the food chain is. Keeping your kids safe means others starve. This goes for plants too, it’s surprisingly easy to empathise with tragedies that occur to other species, including flora and fauna.