Maybe since they're having a rougher time murdering public ones?
http://www.nytimes.com/2006/03/19/business/19pension.html?hp&ex=1142830800&en=0e0f6f1b696f3337&ei=5094&partner=homepage...
In the end, lawmakers modified many of the proposed rules, allowing companies more time to cover pension shortfalls, to make more forgiving estimates about how much they will owe workers in the future, and even sometimes to assume that their workers will die younger than the rest of the population.
On top of those changes, companies also persuaded lawmakers to add dozens of specific measures, including a multibillion-dollar escape clause for the nation’s airlines and a special exemption for the makers of Smithfield Farms hams.
...
Senator Charles Grassley, a Republican of Iowa and chairman of the Senate Finance Committee, believes the bills attempt to strike the proper balance between providing for workers' pensions while allowing the companies to remain competitive.
"My goal is to make sure that companies set aside enough money for the pensions they promise their workers. At the same time, we can't put too high of a burden on companies," he said. "That's why neither the House nor Senate bill requires any company to put in a dime more than the benefits they've promised, instead focusing on shutting down loopholes in the current rules that have been abused."
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The White House has warned that President Bush may veto the bill if it offers too much special pension relief for individual companies and industries.... <yeah, right!>