Let's add to that....
4) if you choose to ignore your symptoms and fly home anyway,then you're spreading the virus (even with a mask on) to potentially hundreds of people.
5) Since you'll likely be contagious/shedding the virus before you even show a symptom,add to the above number.
6) Or you just go home,and no one cares to count that one extra "positive" case gone back to (pick a state,any state) which was actually caught while on vacation in FL at a theme park (hey,keeps FL negative #'s down!)
7) annnd lastly,you then get to spread all those new virus germs you picked up while visiting another state,and now you can share it with your local community.
*what could possibly go wrong?*
Let's be real. How many travelers to WDW are quarantining for a full 2 weeks before they leave,and after they return?