In a 100-yard fight, I can't imagine that a 1 1/2" group would be noticeably more effective than a 2" group.
It's got to come down to durability. If you are going to shoot a ton, you want a gun that holds up. But, if you are going to issue one rifle to every household in the kibbutz, and give everybody a 100-round familiarization course, then put the guns on the rack, then a pelosiload of $400 rifles could do a swell job repelling Hamasholes.