Fine if it makes you happy.WTF. What more did you want?
They left peacefully and apparently cleaned up after themselves reasonably well.
I don't agree with trespassing on private property to protest and especially not to camp out on or harass paying students, but I respect that they left peacefully.
I liken it to cleaning up all the blood from the floor after committing murder in somebody's house. Obviously there's a matter of degree in my example, but the concept is 100% analogous.