Unsecured loans ! How can any CEO of a public company do and get...

Unsecured loans ! How can any CEO of a public company do and get away with these type unsecured mate loans. Seems to happen quite often then they just appear to go pear shape and then over time forgotten/lost. How can share holders cash money just be so simply siphoned out of a company, like who in there right mind would do a loan unsecured. Why ? . Uno you would think there just dividing it up seeing its done so often and easily ..