Maybe because XRP is one of the leading coins in the crypto currency because this coins is rank 4 as of now, thus many people keep buying that coons because of that, maybe they thought that they can make more income if they are going to invest now in the XRP because of its price that still going better.
The statistics of the past are one of the best testimonies of many people's beliefs about buying XRP, even as Ripple sinks into periods where some have predicted it cannot return, Ripple can still break through such very fragile opportunities to return, bad news will lead to devaluation and slide off position rankings but no, XRP doesn't work that way. Instead of acting as an underdog, it remained silent and did not suffer a bit of chipping on the rankings then manifest their powers in a way no one would expect, the strong won't be affected by the news, that's all.