People should also do their damnedest not to take offense when not was intended.
I had a relative die of cancer, please stop referring to Ryan Humphrey as a locker-room cancer.
I haven't and probably wouldn't use that term, and while I feel reasonably confident you're being facetious (about the offense, not necessarily the unfortunate relative), if you were sincere in objecting to the term, I would endeavor not to use it anymore (and certainly not around you). And doing so would place no great burden on me, given that the English language is rich and varied and there are countless other ways to express the same ideas.
Unlike the metaphorical use of "murder," this usage of rape is not one of long standing; it's a recent development and it's a harmful one. Have you ever heard the term in an old movie, for example? I haven't, and I've probably seen more pre-1970 movies than everyone else on this board combined. But the metaphorical usage of "murder" shows up frequently in movies as far back as the 1910s and '20s. That doesn't mean the usage shouldn't be revisited, if people really do take offense at it, but the next time I hear someone (outside this thread) raise an objection to it will be the first time, and I've been here on God's green earth for quite a long time.
My mom beat cancer twice and she died of Alzheimer's. To be honest, I cringe a little and ache a little more when I hear people make a joking Alzheimer's reference when they've suffered a normal lapse in memory. But as much as I loved my mom and as much as I miss her, I know that people who make such joking references mean no harm and it never feels as if they are trivializing the actual disease, so I've never said anything about it and very likely never will.
Using rape as a metaphor is very different.
I sincerely hope none of the "too sensitive" crowd has ever loved someone upon whom sexual violence has been perpetrated; if, God forbid, it should ever happen and your loved one is still debilitated by the experience years later, trust me, you can expect to feel differently.
The FBI says that, in 2012, there just under 90,000 rapes committed in the US (and the FBI definition of rape is very narrow -- there were actually many more than that). It is estimated that only 15 to 20 percent of victims ever report the crime, so deep is the sense of shame and fear associated with it (is there shame associated with murder or assault? Or diseases like cancer?).
These are indeed false equivalencies.
Anyway, I've stated (perhaps overstated) my piece, so I'll leave it at that and move on.