As a nonprofit professional, I have been very fortunate to be able to work in accordance with my core beliefs. I sacrifice a corporate salary to be able to do that. Obviously, different people have different priorities, needs, situations, privileges, values, opportunities, etc. But for me, this has made the most sense for my life and I am grateful to be able to do that and will continue to do so.
Sure, not everything needs to be a purity test. People must make these calculations every day and different people weigh different factors in their calculation. Some people -and I would say many if not most people I know - do boycott certain companies that do not operate in accordance with their values. But it is always an individual decision.
I am not saying what is right or wrong to do. I am simply saying how some people decide things like this. And I am saying how I would decide something like this. Other people are free to decide differently based on the particular factors they weigh and how they weight them. The OP must weigh their values vs future career opportunities/connections as well as potential experience to be gained. Only they can decide which they weight more in this calculation.