The comparison of a statue of Rhodes at an English college and statues of Lenin and Stalin (especially Stalin rather than Lenin) in the Baltic states is specious, in my view - those who live in those countries which were subsumed into the Soviet Union by a tyrannical despot have good and understandable reasons to want to see statues of him removed. I don't think this bears comparison with a statue in an Oxford quad in any way.
Both jeremyp and JP have referred obliquely to what seems to be a growing trend particularly in American unversities which I've heard about through Jerry Coyne's blog website - the infantilisation of students and the situation encouraged where the dialectic, the clash of ideas, conflicting views and contrary opinions, anything even remotely contentious is either banned outright or deemed to stand in need of a "trigger warning." To me adults are infantilised here and treated as rather dim children who have to be guided/encouraged/nudged/threatened into "responsible" behaviour by Those Who Know Best, but for it to happen to young people at university is doubly pernicious. Perhaps it's a skewed perspective based on what I read but it seems to be vastly worse in US universities, though it happens here too.