You can't let the offense scare you into not getting outs. You might make some mistakes on defense but that is how you learn and get better.
There is one other variable that needs consideration...these are 12U players...and in that mindset...make sure your 12U players are aware of all these other variables:
Was the ground ball hit hit hard\soft? Was there a big bounce? Is the batter lefty? Top of the order or bottom? 1st inning or last? Score? Pitcher strong or struggling?
At 12U I think some are making too many assumptions as to their level of game awareness...I'm not saying there are not 12U players who have this heightened level of game awareness, I just think it's few and far between...
Take the out at 1st...EVERY TIME...IMO...Buckeye's stats back that up...
Try to get too too fancy and you'll end up with no outs and runners on 2nd and 3rd...CP