The collateral source rule prevents a wrongdoer from reducing its financial responsibility for the injuries it causes by the amount an injured party receives (or could later receive) from outside sources.
Government benefits received by an injured victim should not be manipulated to benefit wrongdoers who produce injury.
Because it weakens the deterrent potential of the civil justice system, repealing the collateral source rule leads to increased deaths and injuries.
[C]ollateral source reform leads to a statistically significant increase in infant mortality.... For whites, the increase is estimated to be between 10.3 and 14.6 additional deaths per 100,000 births. This represents an increase of about 3 percent. For blacks, the collateral source reversal leads to between 47.6 and 72.6 additional deaths per 100,000 births, a percentage increase between 5 and 8 percent. These results suggest that the level of care provided decreases with the passage of collateral source reform.” …
“The relationships we estimate between reform measures and infant mortality rates appear to be causal.... In summary, these results show that collateral source reform leads to increased infant mortality.” Jonathan Klick & Thomas Stratmann, “Does Medical Malpractice Reform Help States Retain Physicians and Does It Matter?” (March 8, 2004), presented at American Enterprise Institute forum, "Is Medical Malpractice Reform Good for Your Health?," Sept. 24, 2003, available at http://www.aei.org/events/eventID.614/event_detail.asp