Hows about 2M+ in Sudan?
Then there's 2M+ in North Korea?
If one must prioritize among evils, I recommend total body count as the measure.
1M+ U.S. abortions / year is definitely in the running. Let's keep an eye on total death inflicted, and judge accordingly.
The easiest response is the story of a young woman who is knifed in New York City in the 1960's and 34 witnesses did nothing -- not call the police, or anything, as she lay dying for a number of hours.
That was the case of only one person. But to me that one person is as important another person -- being killed somehow.
The numbers are important, but I wish to stay sensitive to the one person who dies horribly [by deliberate act of whatever].