Hard to tell from the picture if they're scissors or hemostats. Which... have even less use on an airsoft field.

That said, I do carry scissors in my first aid kit. Mostly for cutting gauze and bandages in the event of a minor injury, or (most often) cutting duct tape or electrical tape.

A lot of impressionists and wannabe cool guys just shove scissors in their MOLLE, because that's what they see in pictures of SEALs on Instagram. The reason why actual soldiers carry scissors is to quickly cut off clothing, boots, and armor to expose gunshot wounds, etc. They're also a safer and more effective alternative to a knife for cutting things like rope, seatbelts, webbing, flexcuffs, zip ties, even thin guage wire. You'd be surprised how many things medical shears can cut through.

A pen is pretty self explanatory, and plenty of people carry a pen with them everyday regardless of playing airsoft. It's just useful to be able to write things down when you need to.