2 Tim 2:3-4 might pose an obstacle for some pastors, since it is a pastoral letter:
Share in suffering as a good soldier of Christ Jesus. No soldier gets entangled in civilian pursuits, since his aim is to please the one who enlisted him.
If Christians want to pursue political causes, go at it, it's our right, but not from the pulpit. If the Word of God is being faithfully and boldly preached from the pulpit no political messages should be necessary.
I disagree with your hermeneutic. You must consider the whole counsel of God. I suggest you read Grudem and his explanation: