The primary responsibility for any employer Is to make sure its employees have “enough” wage.

I disagree, and I think it works in exactly the same way as the initial question. The primary reaponsibility of the employer is the success of the company. The success of the company is at least partially dependent on keeping good employees with good wage, benefits, and culture. You can get short-term profits out of shorting those things (just like an employee can scrape by temporarily with shit wages, poor benefits, and bad work culture), but in the long term that hurts everyone involved.