the answer you seek, is in the prophecy of the chosen one.
follow:
the jedi caused imbalance in the force, when the Jedi Order was created, as an arm of the galactic senate.
from this moment, the jedi stopped following the will of the force. they followed the will of the people.
they defined "Good" as the Common Good (as per the opera scene in EP3), and anything 'selfish' as "Evil".
they swore to uphold the "will of the people" through democracy and the galactic senate....
(( note: eventually, the will of the people was corrupted by politics until it matched the 'selfish' will of the Sith Lord;
the jedi found themselves using the force to fight a never-ending war for national security, driven by the people's Fear.
they were "using the force" AGAINST ITS WILL -- this causes imbalance in the force ))
....and the Force responded, by spawning its Chosen One, to wipe out ALL force users who were NOT following the will of the force.
Jedi AND sith, alike.
((the jedi were doomed by their connection to the galactic senate -- which was
introduced as "corrupt" in TPM --
they should NEVER have allowed this corrupt body to "guide their actions"))
only qui-gon used the force to enact the will of the force, even when it went against the council (and the senate).
he did not define "good" as the Common Good, as determined by popular vote.
he allowed a higher power to define his concept of "Good", and he was rewarded with Immortality.
in the end, the only one left is Luke, who was taught "let go your conscious self" and "let the force guide your actions".
this is a FAR CRY from the prequel jedis "..we will do EXACTLY as the council has instructed".
the message of SW is not "good" vs "evil", but rather, dynamic morality vs static morality:
if we allow Morality to change according to politics, then eventually good becomes evil.
(its a cautionary tale, re: separation of church and state)
the Jedi Order, being created to serve the senate, was the very mechanism by which the sith took over the galaxy.
(the sith need only control the senate, to control the jedi -- to control both sides of the force)
Balance was restored when the Jedi were no longer sworn to the will of the Senate, over the will of the Force:
when the 'very mechanism' which allowed this to happen, was dismantled.
Balance was restored when (a) the jedi order was destroyed in ep3, when (b) the senate was abolished in ep4,
and when (c ) the sith were finally destroyed in ep6. ((when Luke is free, to follow the will of the force)).
--> anakin was spawned BY the Force .. to destroy the Jedi Order and kill off all its younglings.
(THIS is the ONLY way, for The Force, to restore its own balance).
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short answer:
"Teh FORCE" is anakin's daddy.
he was spawned BY the force, to "...end the destructive conflict and bring order to the galaxy".
(to wipe out the JEdi, abolish the senate .. and destroy the sith)