Ha! Let me explain to you how the sausage is made at [American] universities. You're a fresh-faced researcher with a brand new PhD and you got super, super lucky and landed one of the very few tenure-track positions at a research university available each year. On your first day of orientation, your department head hands you a piece of paper with a number written on it. The number varies every year based on the university and the economy. Maybe this year it's $500,000, maybe a few years from now it's $1M. That number is how much money in research grants you need to bring in to the university over the next 6 years.

If you bring that money in, congratulations, you get tenure; now you get a chance to work on whatever interests you for the rest of your life. But if you fall short of that goal, you're denied tenue; GTFO. You might think being a really good teacher will save you; it won't. You might think that volunteering for some annoying university committee will save you; it won't. You may think writing some really impactful papers (that nevertheless fail to bring in research grant money) will save you; it won't, unless you're really, really, really close to your monetary goal.

So how do you get across the hump? In your first year or two, you think that ethical projects can totally work for you. You bring in a $10K grant here, a $25K grant there. Then you realize you're far short of your goal. So you do what most successful professors do. You start taking DARPA money, DOD money, DOJ money, Amazon or Google or Facebook money. You start building (or facilitating the building of) technology that kills people, that selects people to kill, that monitors populations for trouble-makers or for people susceptible to advertising campaigns. Of course, those aren't the words used in your grant proposals, instead you keep it really abstract. But deep down, you know what your research is going toward.