The intolerant can be viewed as free-riders, as persons who seek the advantages of just institutions while not doing their share to uphold them.
The bad man desires arbitrary power. What moves the evil man is the love of injustice.
The sense of justice is continuous with the love of mankind.
There are various ways you might define the common good, but that would be one way you could do it.
You hear that liberalism lacks an idea of the common good, but I think that's a mistake.
Properly understood, then, the desire to act justly derives in part from the desire to express most fully what we are or can be, namely free and equal rational beings with the liberty to choose.