People like to think that the games they play are rigged to validate what they lose. It makes them still hopeful that they can win if they were to just look for a machine that is not rigged. But it is possible that it is all just a coincidence that you are in a losing streak. Some may even change machines or change position of seating or standing just to shake off any bad luck that may make them lose. People play psychological games with themselves all the time.
This is so true about a typical human behavior wanting to always do the blame game, they always want to find a reason to blame someone about something but not taking responsibility even when they know that with gambling ist taking some level of risk.
Sometimes you don't gamble because you ah e so much to waste but because you either want to make money or have fun but some now do mistaken it for making money alone and so when they are loosing they feel cheated or that the game is been rigged by the machines and shouldn't accept such results especially when they are on a loosing streak.