system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why didn’t Yoda and Obi Wan keep fighting after Order 66? Why did they run and hide? Or if they wait for Luke to age up, why not all 3 go full tilt together?
gpt
The Jedi were primarily working for the Galactic Senate. With their political protection gone, and the Empire turning against them, they became enemies of the galaxy. The safest thing would be to go into hiding. Unfortunately, by the time Luke was old enough, Obi Wan and Yoda were past their prime. You can see the difference between Obi Wan and Anakin in episode 3 versus episode 4. 

Was it the best plan to train Luke too late and to have him take on the Empire alone? Probably not, but that was the will of the Force and perhaps Yoda and Obi Wan understood this.