When I have my client's money rattling around in my bank account, I find other avenues to express my annoyance with them. Mainly complaining to my wife :) If the annoyance becomes unbearable, I quietly find some new position to work at.

It's ingratitude at some level. If workers should not be grateful to their employers for their jobs, that's a different conversation, but yeah, sabotaging an external PR event -- what employer is going to giggle, clap, and congratulate this person's "bravery" ?? termination had to be expected here.

Amusingly, the employee now gets 6+ months of unemployment benefits to contemplate the means of their activism.