Moral objection to what? (Would be the question)
These are low powered toys that are far less dangerous than bows & arrows, or baseballs bats, or a cricket ball thrown at high speed, or a billion other things. Which in turn of course, makes it objectively illogical to have a fear of airsoft but not archery. Guarantee the issue is the look of RIFs, but the aesthetic is quite literally the only 'scary' thing about them.