The main monero developer did a troll announcement which caused the price to dip 25% in a mater of minutes, and kept sinking for a few days. After that 25% dip though, one after the other altcoin started going in red, it was like a chain reaction. And then half an hour later Bitcoin started dumping.
DGB, BCN, DOGE crashed on the 22nd, yet you're saying some pump that ended on the 24th started everything off?
And none of these coins really caused anything by themselves. They're all little boats bobbing about in the sea.