Your logic is flawed.Your argument is completely incoherent. And you have not been able to refute my simple logic problem in the post above. If "a" and "b" are both occurring, and both wrong, attempting to do something to stop "a" which might be possible does not make you guilty of supporting "b", even though you are not stopping that at the same time. This goes back to the simple college level logic problems. If you have 2 men stranded on a mountain and you show up with only enough equipment to get one before a fatal blizzard hits you are not guilty of killing the one you can't help because you only help one climber. This is self explanatory to anyone who thinks this through.
You keep doing this. This is a cheap way to try to play on our deeply held animosity toward Hitler by falsely making some connection that simply isn't there. You did it here too:
That is a false analogy and you know it. The real statement would be "If 25 children are going to be murdered, and you might be able to save 15 by some compromise, would you do so. Of course you would, just like you might release a terrorist in exchange for innocent hostages because that is all you could do at the time. A proper analogy with Hitler might be where you gladly accepted help from the Stalinists to defeat Hitler because he had to be stopped, even though you eventually would have to deal with them too.
If A and B are occurring and you support A to stop B then you are supporting A.
The reason you are supporting A does not negate your support for A.
The problem comes in when A and B are both evil. Then you are actively supporting one evil to fight another that you believe a greater evil.
An example that would work with Stalin is of you supported putting Stalin in power in order to defeat Hitler.
God uses disobedience but God never blesses the disobedient.
You choose to support a pro-choice agenda in order to fight against another pro-chouce agenda (I assume your actual belief is pro-life, but there is a difference between belief and action).
If your candidate is elected then you share the guilt for abortions performed under the abortion as choice platform because you contributed to that platform with your support.