Actually they aren’t likely to see red in the dark. The human eye doesn’t detect red very well in low light. Perhaps you should ask yourself what you would do if someone suddenly pointed a gun at you. You can always take the “wait and see” approach I guess. Cops are responsible for more than their own lives so they might not want to do that.
So I guess the best thing to do is either remove that red thing or paint the whole gun red ....