The Real story
So Disney makes the fast pass to help limit your waiting time.
So what do people do??? they try to exploit two weakness in the system to SAVE
EVEN MORE TIME

(not happy enough that FP is saving them time to begin with)
Type 1 DAD GETS UP EARLY AND GOES TO EPCOT while darling family enjoys breakfast at Cape May (how nice!). DAD is next seen screaming at poor cast member about why his
5 tickets won't work in the fast pass machine
Answer- because the 4 tickets weren't activated when only yourself used 1 ticket to get in the gate to Epcot. (all 5 people have to pass through the gate each day to activate ticket before it will work in fast pass machines)
Type 2 DAD RUNS TO GET FAST PASSES WHILE REST OF FAMILY GETS a head-start in line. Dad returns and cuts everyone who is playing by the rules.
Answer- Disney could require a finger print scan at each fast pass machine for each member of the party, so that like the Park Entrances ... each person must be in attendance to use the nice perk called fast pass.
(Won't Happen, but it would stop the OP's original question on this thread)
Type 1 Dad is cheating the fast pass system, and
not getting away with it
Type 2 Dad is also cheating the fast pass system which is built to save you time....but not at the expenses of families who got in line together (because they wanted to ride together)
So type 2 Dad is breaking the spirit of the law, but feels its OK because he doesn't get caught or pay a penalty.... only has to cause small amount of grief for all others in line

FIGURES TO HIMSELF- "NO PROBLEM, I CAN LIVE WITH THAT...they are suckers for not thinking of the same trick"

Justifies behavior by thinking- time is more important to Me and my family, than the majority of people that are waiting in line the proper way.
.