Should directors restrain their pay increases while workers' pay is frozen?

No.

It would be nice if they did, but then businesses don't exist to be nice. It is illogical to state that all workers should have linked pay, since the employment markets for top management and lowly workers are fundamentally different. Any profit-seeking company will seek the best value from both markets. Accepting this won't change without considerable governmental interference, the best option for unhappy workers is to quit and start businesses of their own.