If the whole "few bad apples" argument is valid, then the premiums will stay low.
Like car insurance, an officer's premium will go up and insurability will go down with continued claims.
This will root out the bad apples and protect local budgets.
Arguments have been made that this will cause cops to second-guess themselves in the line of duty. They'll think "how will this effect my premium". Welp, they should already been considering whether their actions violate an individual's civil rights. This just shifts the liability from the tax payer to the perpetrator.