You are a transport operator on the Enterprise. An away team of Linux, Gcc, Rpm and Gtk go to planet RedHat. When you are beaming them back, you notice that something has attached itself to the team. You have 2 choices, first you can pass the input stream through the medical filters and remove the item if it’s a problem (or if it fails to remove the problem put the team into isolation or back on the planet until you can determine if it’s a problem or not), or else you can let the problem in and wait and see what happens.
The analogy is bad because the transporters in Star Trek shouldn’t allow option 2 because you just can’t let unknown stuff in without risking the whole ship and crew.