There's no difficulty in understanding the author, it's quite clear she converted 1 in 6 sexual assaults in a life time to 1 in 6 men are rapists then said "but if they commit 10 rapes it's 1 in 60".
What I don't understand is the denial. Whether she said it or not it's quite clear what she's done in order to get the numbers she did. It's WRONG. You can't do this. It's not statistically valid in any way. You can't convert sexual assaults into rapists.
Look, I'll try this one more time, mostly because I'm bored at work. I have absolutely no hope that you'll understand it the 95th time around.
1) 1 in 6 women are sexually assaulted at some point in their life.
2) The male and female populations are roughly equivalent.
3) The minimum number of men needed to rape those women is 1.
4) The maximum number of men who could rape those women is every man in the country so long as they rape the same 1 out of every 6 women.
5) Neither 4 or 5 is true.
6) If we assume that multiple men rape the same women, then there will be more rapists in relation to the general male population.
7) If we assume each rape victim has a unique rapist, and vice versa, then roughly 1 in 6 men will be rapists.
8) If we assume rapists have more than one victim, there will be fewer rapists in relation to the general male population.
9) To be conservative, the author chose the approach that would yield the most generous number, ie, fewest rapists in relation to the general male population.
10) Thus, if the average rapist has 10 unique female victims, and those victims are not shared with other rapists, then 1 out of every 60 men will be a rapists.
11) That cannot be true, but the error is in favor of a position contrary to the one she is advancing.
Now, it's fair to say that she didn't refine the stat based on situations, but as I said earlier, there are no stats to reflect what percentage of people who harrass women on public transit become sexual assailants. Because a perfect stat wasn't necessary to her point, that men respect women, it's largely a spurious issue.