That's mostly because people can't "afford" to get involved. They don't have the mental bandwidth or time to handle another person's burdens for longer than a few moments. How many times have you seen a sad post, ad, or article about some starving animals or unfortunate people, felt bad, but scrolled on like nothing happened? We see devastating loss of life and forget about it 5 minutes and a cat video later. That means we can't help or are too preoccupied with other priorities. That's just how the world is—people don't have the luxury of taking on others' sorrows. They have their own baggage to carry.