A couple of things to point out:

1) As Roberts says, Trump’s tax cuts did help increase the economic expansion. The cuts helped raise profits, which did moderately stimulate economic growth. Even though it’s true that most of the money saved went to stock buy-backs and things like that, some of it did go into the real economy.
2) The (slow) increase in wages is, in fact, tending to destabilize the economy. That’s because increased wages cut into profits, which causes the capitalists to be less willing to invest.
3) What all of this means is that for the economy to grow, workers have to suffer.