A pilot was arrested for rioting: https://www.scmp.com/news/hong-kong/politics/article/3020736...
An employee leaked the itinerary of members of the HK Police force: https://www.dimsumdaily.hk/cathay-pacific-staff-leaks-travel...
Social media videos of Cathay Pacific staff involved in protests, shouting, arguing, etc. This damaged the brand.
The Swire Group (British) owns 50% of Cathay Pacific. The airline needs domestic routes to stay in business. The CEO failed to maintain calm and discipline among staff, bringing Cathay Pacific into disrepute.
So the owners and the board of directors decided to act.
Before the CEO resigned, the company sacked "four members of Cathay staff for taking part in, or in relation to, the demonstrations gripping Hong Kong" https://www.scmp.com/news/hong-kong/transport/article/302312...
The board also wrote:
> recent events have called into question Cathay Pacific’s commitment to flight safety and security and put our reputation and brand under pressure. This is regrettable as we have always made safety and security our highest priority. https://news.cathaypacific.com/cathay-pacific-announces-seni...