nah, respect the hussle, if you work your ass off you should be rewarded accordingly

Probably not, I know I wouldn't be willing to work as hard as I do for the same pay as some cashier at McDonald's with zero responsibilities

Would the world be a better place if everybody got slapped according to their behaviour?

Nope. Less incentive to achieve more means crucial positions such as doctors are less likely to be filled.

Hard to say. We wouldn't have the huge wealth imbalance problem and there'd be a heck of a lot less corruption, but how would people be incentivized to do really unpopular jobs, or jobs that take 12 years of higher education, for example?

No because it would kill everyone's work ethic. Why struggle through school for a rewarding career when the valet makes as much as the cardiologist? Also, I hate the notion that being "liberal" = communist. There's a clear distinction between wanting everyone to have a fair shot vs giving everyone a guaranteed income.

Other things would come up. People would probably steal and wage wars to end up with more.

No, but it would if nobody had any monetary income

that alone wouldn't do it if the underlying culture that created the income gap in the first place was never address - the misery would likely manifest in other ways

If it was enough, it certainly would bring many benefits but then we may had to deal with one of them deadly sins more often, envy. Like "You work much less and my job is far more important!!" or "You only have your bitch wife and I have like 3 wives and 19 children." etc. Humans you know, they infest every system given to them.

I'd like to think so...