Individual should be assumed flawed, shortsighted and selfish. As long as the individual makes decisions for herself its all ok, it is considered freedom. The problem is big companies act like the individuals even though their effects are far reaching.
But companies are just made up of individuals. Individuals make the decisions. Therfore they should be held under the same scrutiny.
The difference is individuals have tons of direct consequences for their actions, but individuals inside (big) corporations who make bad decisions are masked and protected thanks to the legal system (corporate personhood), government policy and influence of money on both of those.
Acting maliciously results in bulk monetary settlements and rarely result in the individuals getting burned. Just look through the yearly pharma settlements, they pay a small percentage of their revenue and things continue on business as usual with zero market effects:
