The question of what's right and wrong is a topic for religion and theologists.
I don't mean that in a cynical or nasty way. As the years go by I get more convinced that the rise of atheism is causing some of our biggest problems in western society, and I'm not religious myself. But it seems that for all its flaws, Christianity at least was an infrastructure of people and principles that hung together in some vaguely coherent manner such that people could pose the question "Is this right? Is this good?" and either answer it themselves by reference to a book, or ask it of a full time moraliser (priest).
The reason the OP is expressing unease at this kind of tech worker "morality" is because it's wafer thin in a way that makes medieval theology look like a towering pinnacle of intellectualism.
They aren't making moral judgements of their customers consistently. ICE is targeted only because a bunch of journalists started covering it extensively as part of their anti-Trump agenda. ICE did similar things before Trump but they weren't in the news, so GitHub workers ignored it.
Moreover their morality isn't universal. ICE is bad because it hurts people who only want a better life. OK, so, should there be no borders at all? What happens then to all the American workers in marginal jobs who suddenly lose their income because an immigrant willing to live in practically sub-Saharan conditions took their job? That worker only wanted a better life too, do they not matter? If not why not? Is it because they're white and GitHub workers are racist against whites? What about other border control agencies? What about governments in general?
Christian religious morals are very far from ideal but at least make a show of being universal. You forgive those who trespass against you - it doesn't matter who they are or what they did. You forgive them. You are the good Samaritan who helps those in need. Doesn't matter who they work for. You love your neighbour. Doesn't matter if they voted for the other guy.
You're arguing that tech workers should engage with morality as if it's any other hard question that can be whiteboarded out in a few hours. But tech workers have got nothing to say on this topic that hasn't already been said hundreds of years ago. They have no special insights to provide. The rigour of their moral logic is trivial compared even to a bunch of men in funny clothes reading stories about camels out of a book written anonymously 2000 years ago. Why shouldn't they be reminded of this?