Many people have a misconception: people with high levels of cognition must be lonely.
In fact, they may not be lonely. It's just that you use your own perspective to put yourself in their shoes and think they are lonely.
Just like a summer insect, if you enter the children who are making snowmen and having a snowball fight, you will feel that these children are suffering from great hardships. Or, a fish in the water, seeing the animals on land, may think they are enduring hunger and thirst.
To be slightly rigorous, many of the "not lonely" habits, social interactions, words and deeds that people think of are most likely just matching their own emotional needs at their level of cognition, rather than universally applicable. It's just the observer bias, and the illusion caused by thinking that one's own values and emotional circuits are common.
This bias and illusion are very common.
To measure others by one's own heart, this will bring many problems:
Maybe, you trusted the moral bottom line of others too easily.
Maybe, you ignored the harsh and unbearable environment that others were in, and made excessive demands on them.
Maybe, you tried to guess and predict the emotions, attitudes and behaviors of people who are different from you, resulting in noise in your decision making.
So, remember one thing: before we reach a sufficient level of cognition, we should respect and awe the diversity of humanity more.