Well, to be fair, a lot of people probably do support the idea that their own country checks the documents of people who enter and exit through their borders, and are maybe glad that the country they are visiting is similarly careful, but in principle, someone might want to emigrate to Antarctica, and never return to their country of birth, and for them it would be an unnecessary burden to have to apply for a passport.
I made the deliberate decision to travel and see different cultures.
But to be frank, I was more or less forced, because I was traveling with my parents ;-)
A mandatory ID card says that every citizen has to prove their validity to the state, and it is the state which can grant or revoke that validity, rather than the state being the servant of the citizens.
There have surely been enough examples by now of successful countries not requiring mandatory ID cards, and examples of ID cards being abused by governments for discriminatory policies, that I don't know why they have such support.
http://www.preventgenocide.org/prevent/removing-facilitating...
https://privacyinternational.org/long-read/4472/exclusion-de...
https://bc.ctvnews.ca/99-of-indian-status-card-holders-have-...