MM's can and will do what they want. If folks realize that they do it for profit to screw the people they're trying to facilitate trades for, they'll understand why the market makes such wide gyrations at certain times. Options expiration is all about this stuff. If you want to trade this market, that's the compromise you have to make. If you know they're out to screw you every which way possible, you can at least understand what's going on.
It's not a conspiracy, it's just the MM's are not like the United Way or UNICEF.