I’m not sure if you have your decision yet, but thought I would add my son’s perspective. He is a junior who grew up in the Seattle area and conforms with all that entails. We were on campus last month for the Junior Parents’ Weekend and got to meet quite a few other students and parents.
We worried a bit about sending a liberal, middle-class boy into an area that has a reputation for religion conservatism. We are Seattle Catholic, helping stock food pantries and build schools but largely ignoring the politics of the church. He loved his poli sci classes. He said, “Discussions are great. There are a variety of views but nobody’s a jerk about it.” His close friends run the gamut from “another Seattle kid” to “almost became a priest.” Political spectrum matters a lot less there than most places.
As for some of the other points that thentt brought up:
mostly wealthy - yep, as it is at most top privates, but the way the living arrangements are done this matters a lot less than you might think.
white - majority, yes, it is in the midwest where this is common. Again, the dorm system socially integrates in an unusual way.
conservative politically - somewhat, but not in a way you would see in the South, and probably a lot less so than its reputation. They did send around 800 kids to the anti-abortion rally in DC. Again, nobody’s a jerk about it.
heavy party lords socially - um, disagree, especially after having two others who went to state schools. My youngest son does not drink. He still has a social life. The dorms set up small common rooms with stereo systems, have parties only on the weekend with beer only and only behind closed doors. They shut down at prescribed times and all gets back to their own beds. Some students party a bit more, but with everyone required to be on campus until senior year it is way less than most places. A very few (with money) keep their dorm room but live in apartments off-campus anyway.
Good luck, and let us know how you decide.