Why are facial expressions culturally universal?

Hello. The answer to your question is simple!

By virtue of their biological origins (1⇓–3), facial expressions have long been considered the universal language to signal internal emotional states, recognized across all cultures. ... Like a generative grammar (19, 20), we randomly generated all possible three-dimensional facial movements (see Movie S1 for an example)

Explanation:

Hope i helped!

it is a part of john locke's natural rights popular during the age of enlightenment that people had inalienable rights to life, liberty and property. this was reflected by thomas jefferson in his declaration of independence as rights to life,liberty and the pursuit of happiness.

another line in the declaration of independence is that people have certain rights just because they are human. humans are capable of obeying the three natural rights john locke mentioned making them governable by these laws and therefore entitled to these rights as well.