Because that is exactly what it is. Fear mongering! If people have more money, they spend more, more being spent helps the economy. Common sense that the government and business like to ignore. We saw it in Santa Fe several years back when they decided to raise the minimum wage higher than any place else. The doom and gloom was amazing and guess what, it never happened.
From the fear-mongering headlines marking passage of $15 statutes in New York and California, you would think nobody ever dared raise the minimum wage before.

"Raising minimum wage risky," the Lexington (Kentucky) Herald-Leader tersely warned.

"Raising minimum wage hurts low-skill workers," the Detroit News bluntly declared.

"Even left-leaning economists say it's a gamble," Vox solemnly cautioned.

Nonsense. We have been raising the minimum wage for 78 years, and as a new study clearly reveals, 78 years of minimum-wage hikes have produced zero evidence of the "job-killing" consequences these headline writers want us to fear.
Minimum wage effect on jobs - Business Insider