One for the "Party Poker is rigged" theorists

Now, I've always known that Party Poker is rigged, because I've been playing occasionally over the past year and a half. Runner runner cards, miracle rivers etc. are so commonplace. Any two hands are literally almost 50/50. Take this one in the $150+12 earlier.
I raise 4bb utg (only 2nd time in game) with JJ. One guy MP calls w KJo (as if that's not bad enough). Flop comes 235. I bet 150, he minimun raises, I reraise to 600, he calls. River comes Q, I go all in for my last 400, he calls, and the river is the K. Tell me the motivation for this play here? Either he's a bot and knows something I don't, is extremely dumb and hit his 1/15 shot or Party Poker is rigged to produce action hands. I'd go for the latter.