These beetles are after the over ripe fruit, period. You are doing the best method of 'organic' control by keeping the very ripe fruit picked and the fallen tomatoes discarded. You might want to collect the tomatoes before fully soft ripe.

rhizo, gotta ask - never heard of "beer bugs / sap beetles - are we talking about stink bugs damaging tomatoes or what?
hortster

This is a little beetle with a lot of common names. Look up 'sap beetles' and 'picnic beetles' and you'll also find them listed under 'beer bugs'. I first learned about them under the name 'Pleasing Fungus Beetle', as they are considered one of that group, too.

Look for them on fallen fruit, overripe strawberries, oozing sap from trees, mushrooms, etc.