I do want to follow up to my own comment here, and just mention that I realize that capital's entire point is to get us to blame each other instead of capital (e.g., American software vs Indian|Chinese|etc software).

The moral of the story is that two things can be true at the same time: A lot of H1Bs are rightfully thrilled at the opportunity to work for decent US companies and make decent money to provide for their family. While a lot of American engineers are rightfully wary of the knock-on effects of hiring workers who can be cheaper and more 'malleable' (in a manner of speaking).