Technically if you're only drawing up 1cc it's not even necessary to inject air. You'll still be able to draw what you need without difficulty. Let me rephrase open to air, you are placing your equipment more than likely on a bathroom or kitchen countertop which is not sterile, in an OR they're equipment is on a sterile field keeping the chances of bacteria from coming in contact with their equipment very low. I guess it goes along with the same reason if you put your hands below waist level you've just broken sterile field. Who knows why it works but there's studies and proven fact out there that these techniques keep bacteria from invading. I'm definitely not arguing with you, I thought it could just share some insight.