GA pilot reported on an announced 2 mile final observed a jet aircraft enter the runway and depart resulted in pilot's only option; to avoid a conflict; was to land short on runway.

Narrative

I was on the RNAV 5 approach into SOP. Announced my position at 10; 5 & 3 miles. Aircraft Y; called on UNICOM; taxiing from the ramp to [Runway] 5. I told Aircraft Y I was on a 2 mile final full stop. Aircraft Y approached the hold short line for [Runway] 5 and I told Aircraft Y I was on short final. Aircraft Y did not stop; said 'We'll hustle' and proceeded to take off. I had full flaps and gear down; stabilized at 105 kts so I was too low and slow to do a steep turn. Also I didn't know if Aircraft Y would go straight out; turn right or turn left on take off. Ordinarily; I would have performed a go around in this situation straight ahead to sidestepped to the right but I didn't know where this jackass was going to go. I reduced power to idle; pulled up into a near stall to slow down and used the rapidly increasing sink rate to land as short as I could. I touched down around the time Aircraft Y rotated. Sure enough Aircraft Y climbed straight briefly then turned right; right where I would have been if I had gone around straight ahead or to the right side of the runway. Aircraft Y belongs to a fractional [FBO out of Location] according to Flight Aware and was on [a nonstop flight from SOP].The Aircraft Y cowboys seem to think this kind of behavior is normal and acceptable. It isn't. Landing or taking off into opposing traffic; overtaking and passing on downwind; using non-standard procedures at a one runway non-towered airport; cutting off traffic on final all have been all too frequent at SOP. Someone is going to get killed if this doesn't stop.