If you dont use them people will think you're scared to use them. Look at Russian nuke threats no one gives a fuck anymore. Now they have to nuke someone to regain that aura. Then when they do everyone will be pissed at them.
If they'd set a single red line then nuked when it was crossed everyone would respect them and they'd have huge nuclear aura and no one could fault them.
Do you think there is no growing wealth disparity under socialism? Do you think an Nvidia employee is going to earn the same as a person working at a small business? People will always have tools to create wealth disparity. Even in a moneyless society people can create wealth disparity.