Because it makes for an unstable economy, which isn't good for business.
Economy will be stable. It is the social cohesion that will suffer.
Still there are conditions and there are businesses for which that isn't true. Conditions under which a stable economy is not as good for business as an unstable one. And businesses and businessmen for whom an unstable economy is great for business.
Under what conditions is instability preferred? Generally, in any stable economy which is sub-optimally stable -- in these it is necessary to go through a period of instability to have a chance to reach a more optimal economy.
This being America we have a bountiful national prosperity that was birthed in such an unstable transition phase we called the Revolution.
There are other cases that come to mind. It may well be, and I believe it is by analogy to childhood development theories, that the most long-term vital national economy must go through a long -- unending even -- series of periods of stability and instability. In childhood development these are called periods alternating of looking-inward and interacting-outward. The most famous "interacting outward" period being the "terrible twos".
And as we know from raising children -- the most important thing for development is how the adults react to and train the child in those periods of "outward interaction".
A brat is a child who has been allowed to run rampant during such periods. And just as there are always brats-waiting-to-be if unchecked, there are businessmen and businesses waiting to use, and very able to use periods of instability to become the adult equivalent of brats -- tyrants and oligarchs.