What has led you to this conclusion?
I’ve observed the opposite to be true: employees have more incentive than investors to seek the long-term success of a company. Building a career within a company and industry requires an investment of time and effort. Career changes are slow and become increasingly difficult. In contrast, investors can invest in anything so investments are more liquid than careers. In the case of a company failure, well managed investment portfolios are exposed to significantly less risk than the typical salaried career.