Well a Jedi is supposed to protect.
If they don't protect anyone, they're not fulfilling the basic point of being a Jedi, and can't be called a true Jedi. They still technically are one, but if they hide, do nothing to help others, or stop the sith, then what good are that as a Jedi?
Obviously the sith saw this... and if Bastila hadn't done anything after four/five years (I think it is between K1 and K2) but fret about Revan, she's obviously not a threat.
"If God is a DJ, then life is a dance floor, love is the rhythm and you are the music."