I agree with you about free speech, and if it was only the poster hanging in the student union I wouldn’t be quite as concerned, although IMO the poster is offensive and it, along with other political posters, does not belong in a public space that’s meant for students to relax in (I’m speaking about the area in constant public view, hallways and other spaces that don’t directly face the main space would be different).
The fact that Jewish students were left without a rabbi or Hillel director is troubling. Apparently someone has been hired on a part-time basis to run Hillel, however he has no experience at Wellesley and I believe came from the IT department of another Jewish agency. Why didn’t they just leave the then-current director in place? There has been no mention of any alleged bad conduct by either of the fired employees, so the firings make no sense unless their purpose was to weaken Wellesley’s Jewish community. I don’t think it’s a coincidence that this all happened at the same time that Wellesley anti-Israel groups became more vocal (I’m not blaming the anti-Israel groups for the firings - they don’t hold that kind of power - but it seems that an administrator or donor is extremely anti-Israel and/or anti-semitic, and that his or her views are being given credence, regardless of whether the college’s actions are discriminatory.