I don't disagree with these sentiments, but the hope that engineers/IT staff will leave is wishful thinking. I speak from my own experience which my differ from others in other industries/regions/countries but, I find people who work in tech to be generally dispassionate with regards to the downstream effects of their contributions. I think that's because:

a) We're often small cogs ...

b) ... working on often interesting technical problems that require much detail ("think down here" I was once told by a manager, who put his hand to the ground, "not up here" he said putting his hand up and waving it[1]) ...

c) ... and we don't always get to choose. Not everyone is a superstar who can leisurely choose which exciting opportunity to pick and choose. And yes, most of us have rent/mortgages/children/ other obligations to concern ourselves with.

...even if we aren't necessarily all amoral.

1 Luckily I outlasted him in that company. :-)