If they are so worried about trillion dollar negative impact of crime in the US and want to make US safer then maybe ....
Make criminal justice system and post release process more about rehabilitation, when ex cons struggle to get a legit job, afford accommodation then going back to crime often seems the only option
Decriminalize a few commonly used drugs (kudos at least part way there in some states) to stop people getting criminal record for "crimes" that are almost based on a coin toss e.g. alcohol = OK, weed = crim
Have to add (just to get a few commentards frothing) - do something about the US gun laws, in the UK it is harder to legally get guns and various types of gun very difficult / impossible to get for personal use (plus a whole lot of sensible rules on how they are carried in "public"). Unsurprisingly gun crime deaths are low - yes we get violent crome (e.g. knives) but its a damn sight harder for someone to kill lots of people with a knife, close up than with an automatic at distance