Why Is Nelson OK With Using Reconciliation For Tax Cuts For Millionaires But Not For Health Care For Americans?

Given the fact that three out of four of the reconciliation bills Nelson has supported mostly benefited the wealthiest Americans, the logical question to ask is why the reconciliation process he has supported in the past is apparently appropriate for siphoning wealth to the richest Americans but not to get health care for tens of millions of Americans who lack it.
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Update Sens. Bayh (D-IN) and Lincoln (D-AR) have also said they are against reconciliation. Lincoln has previously voted for a reconciliation bill that gave massive tax cuts for the wealthy, while Bayh voted for the College Cost Reduction Act of 2007, which was passed via reconciliation. LinkHere