The people who signed this letter can go fuck themselves, they are literally reaping what they themselves sowed and are still sowing in the very letter they signed.

EDIT:

In the letter, they say:

The democratic inclusion we want can be achieved only if we speak out against the intolerant climate that has set in on all sides.

The way to defeat bad ideas is by exposure, argument, and persuasion, not by trying to silence or wish them away.

In the letter, they also say:

The forces of illiberalism are gaining strength throughout the world and have a powerful ally in Donald Trump, who represents a real threat to democracy.

These so-called writers don't know the definitions of irony and hypocrisy if a fucking dictionary struck them in the face.

The people who signed this letter can go fuck themselves, they are literally reaping what they themselves sowed and are still sowing in the very letter they signed.