Two part answer:
To go back to what you said about "permission", there's a lot of truth there, alcohol socially gives permission to do things we usually WANT to do but are sometimes socially discouraged from doing, for example, being open, or being vulnerable is more permissible after a few drinks, AND because of a few drinks. Intimacy. Expressions of love or attraction.
Men are able to say I love you bro, or I love you man. Sex and sexuality also becomes both easier in some ways, and less stigmatized. "Oh I was so drunk I made out with some random hot guy" So think about the value of that.
Second part: is the two drink theory of chaos. Two drinks acts like a single cup of coffee, in some ways. It relaxes you, lowers your inhibitions, makes you more open, looser, whatever. After
drink three, the chaos part comes in, and that's where most of the "bad" occurs. No one gets into a fight, or abuses someone, or spirals out of control after two drinks. It's always more than three.
That gets into the scientific properties of alcohol.