I will try to put a positive spin on it aswell.
If the options were granted as part of his remuneration, he is taxable on the difference of the exercise price and the market price at the time of exercise (ie. the benefit from the options is treated as taxable income). Therefore it is in a employees best interest to exercise as soon as possible if they believe the share price is going to increase in the future. However, that crystalises a tax liability to it also force them to sell them to pay the tax.
Therefore exercising the otions rather than letting them run is a positive sign and selling up is just a natural consequence for tax reasons and the other reasons that I quote above.