Gerrymandering

How can gerrymandering (dividing voting districts so as to give an unfair advantage to a certain party in  elections) be justified? While i understand that this is just another way to advocate for a particular party, i believe that the manipulation used in this process is just short of fraud..to be put rather bluntly. I just feel as if this issue is often overlooked because it has become hard to hold politicians accountable for their underhanded actions..but we must. We need to stop the power grab and protect voters and the electoral process. To do so i think it would be smart to vote yes on Prop 20 so that the voter-approved Citizens Redistricting Commision, not politicians, will draw congressional districts. For example, Sacramento politicians still draw California districts so that their friends in Congress are basically guaranteed reelection. We need to pass Prop 20 to prevent this. Furthermore, it would also be wise i feel to vote no on Prop 27, because it is another blatant example of a political power grab. Overall, i think it is obviously unfair for politicians to draw their own election districts because they do so only to protect their jobs.