Don't we already? Police and DAs at least here in California are not serious about punishing shoplifters AFAICT. I hear people say this is specifically because of the 2014 Proposition 47 (raising the threshold for felony theft from $400 to $950). Not sure that's true (misdemeanor theft can still be punished by up to six months of jail time and/or up to a $1,000 fine, and California's current thresholds are similar to other states) but there was a federal mandate to address prison overcrowding, and California chose to do that by not having as many prisoners instead of building a ton more prisons. Prop 47, and perhaps some policy changes made with far less fanfare, were intended to achieve that.

There's still more deterrent for misdemeanor shoplifting than for nationwide egg price-fixing though!