Is peace found in telling Christians not to debate the political divide between Christians in the US?
It doesn't promote peace to support or condone behavior that further weakens and splits up the Christian community.
A major divider keeping Christians apart is politics, and one of the instigators of this division has actually been the idea that it is okay to be on either side of the aisle. Is it okay for Christians to vote for either of two major political parties when one has many constituents and associated groups who actively work to remove Christianity's presence from the public? Is peace being genuinely promoted when Christians are asked to see this as okay?
It isn't right to hate other Christians who vote for a political party that has ties to strong anti-Christian influences in society. However, it isn't right to talk about peace in terms of supporting or condoning the wrong political allegiances or simply staying out of politics. Christians want to actively urge one another to vote for a political party whose platform, constituents, and associated groups promote both their freedom and the freedom of others to express their beliefs simultaneously, and it can certainly be done.
To help unify Christians in promoting their freedoms in the public square, they must urge one another not to vote for people associated or directly involved with the suppression of Christian freedom. Asking Christians to condone what is happening or even support it doesn't promote peace but further division. It doesn't promote peace to support or condone behavior that further weakens and splits up the Christian community.