Can govt bailouts be challenged under equal protection clause?

I mean isn't the govt being subjective in deciding what industries and companies get govt money to keep them from going out of business.....helping some generously and honoring their contracts and allowing huge bonuses while telling others they are on their own and that their employees should get way less pay and their execs should work for dirt cheap? and where does it all end??? why are some stockholders getting their investment in a company protected by their govt while other stockholders's stocks are becoming worthless at discretion of govt???