As others have said, you see more bad beats (and coolers) online, because you play more hands. Maybe an online session for an average player is 1.000 hands, but if the same player goes to a brick and mortar casino, its only 200 hands. And of course 5 times more hands means 5 times more of everything. And since the human brain tend to remember bad outcomes more than good ones, the times, we got sucked out on, or our kings ran into aces, gets noticed. And this then lead to confirmation bias and theories about online poker being rigged.