What do you call when someone does something that they already wanted to do but only do it because they saw someone else do it?
For example the Brexit business, or America after Trump became president. After these phenomenons people started saying racist things, and it kind of revealed what they actually wanted to say, but only did so because other people were doing it too. They probably know it's bad, but they want to say it, and they do because other people are saying it too, I assume.
I'm giving a presentation on Brexit and the title would be something like this: "Brexit and racism: causation, correlation and _______"