First of all, it's a strawman - just because you're focusing on the present in general doesn't mean you're unable to look at the past or future, and just becaus

First of all, it's a strawman - just because you're focusing on the present in general doesn't mean you're unable to look at the past or future, and just because you're focusing on the past/future in general doesn't mean you're unable to enjoy the present as well. This is true of people who learn to live in the moment despite it not being automatic for them, and its when they do it in a social context that demands paying attention to the past and future. If a group of humans innately lived in the moment, they would be unlikely to learn to care about the past and future. An individual who was born with that innate tendency in a social setting that does care about the past and future might learn to care by absorbing the values through socialization. But the values have to come from somewhere, and they're less likely to be ignored of people care about them by their nature.