Think about what happens to the stock price of a company once it stops growing. It falls through the floor. It could be making enough money to pay all of its employees, and making the world a better place, but if it doesn't grow, then if it has already gone public, the stock price sinks, and all of the employees who hold stock lose a lot of money. If it hasn't gone public, then the VC's get really upset. An example of such a company was Cygnus Support, which was in no danger of going out of business, and it was supporting a hundred or so engineers and their families, which were producing high quality open source code (such as GCC, gdb, etc.) so it was certainly making the world a better place. But it was considered a failure because it didn't give the VC's a lucrative exit. That's growthism. Fortunately for Cygnus's VC's, finally Cygnus got bought by Red Hat many years later.

But Red Hat is going to end up in a similar boat; as a public company, if it can't figure out a way to sustain an significant growth every year, forever, the stock price will get punished. And of course, the problem is that companies can't produce a sustained compounded growth forever, because sooner or later compounded growth will cause the company's required revenues to exceed the world's GDP. So the trick is to stay on the rocket ship as long as you can, and then sell the stock to a greater fool before it tips back towards earth. And that's growthism, too....