” Moreover, as happened with the Midianite women peritzut often leads to a”z.”
Which means that pritzus is worse since it can lead to both.
“Missionaries have arguments from the Tanach which those with little or no background (and even those with background) do not know how to refute.”
I was referring to Frum people from very strong backgrounds (although I don’t know if I made that clear or not).
Also, I’m not sure if they missionarize in catholic colleges. But if they do, and if the student is from a not-Frum background and/or Jewishly ignorant and/or weak in his Emunah, then you may be right. But that is not the type of case I had in mind.
Also keep in mind that in that case, some of these problems might potentially exist on a secular campus as well (although it may be less).
The other difference is that pritzus is a problem as soon as you see it. Being surrounded by ovdei avoda zara is not a problem in and of itself.