What is wrong with the some people in library

I'm currently writing this post while sitting next to a couple in the library, this couple has chatted for the previous 2.5 hours or so and being showing pda. Idc bout pda, I just care that it's the library, you came here to study, so shut up and study. They are talking on normal volume while sitting beside me, I would attach a picture but let's respect their privacy. Should I say anything to them or leave it?

I do however appreciate the library guys, these days they have randomly started coming to the rooms and asking people who are talking loudly to get out of the halls (or library idk). Much kiddos to them.