Odd/interesting that they don't mention motives. They give one example of using acid to commit a mugging. Yet[1] seems to state that acid attacks are mostly male-on-female violence for relationships/shame issues.

https://en.wikipedia.org/wiki/Acid_throwing#Epidemiology

So it is a real threat to tourists? It's like when you hear about high crime in some area, but it's mostly gang members killing each other -- it's a somewhat irrelevant statistic for tourists. London should release demographics on who is doing this to whom.