Wait, what? Where's your source on this.
Via google I can find references to one case from 1997 and one from 2002, and that's it. The idea that this would in any way be "decently common" here is preposterous.
In any case the leak of health information is nothing to laugh at e.g. for those who live under threat of "honor violence".
[1] https://www.na.se/artikel/hallefors/man-i-hallefors-anhallen...
London Metropolitan Police showed a sharp rise in attacks, with 465 recorded in 2017
Particularly common in London, and amongst some immigrant communities. Other countries are not so far behind, and I gather it is quite common in some of the developing world, like India and Pakistan.
Seems like it may have been noticed being used for honour attacks in communities in London, Bradford, Leicester etc, and escalated from there. A particularly horrible form of attack.