Assumes that because something could happen, it is inevitable that it will happen.
"There are many hackers that spread worms through the internet.
Therefore, if you use the internet without a firewall, it is inevitable
that you will be hacked sooner or later."
While using a firewall is a prudent and sensible measure, it is not
inevitable that a hacker will attack an unprotected computer. The
argument does have some backing logic but overstates the worst case scenario.
This argument has the form: Possible P, Therefore, P
The argument is mathematically flawed. There is always a chance that P will not occur, and therefore, no proof that P will occur given its probability.