Regardless, the police get sued all the time anyways. It's just that the burden currently falls on the taxpayers.
I fail to see how this would change anything other than increasing taxpayer costs further in the form of insurance profit margin.
Now you'll do the same thing with police, as if police wages and salaries won't increase proportionally, but 20 years from now you'll wonder why that costs so much. It's bizarre how economically imperceptive everyone is.
We are already paying increased taxes to deal with all the lawsuits we already incur because these people know they are above the law and they think it isn't their problem.
Every interaction with the police is a dice roll to see if someone lives or dies.