One might have a standard that we should refuse to admit refugees if this will lead to even a single terrorist or criminal incident.
One might also have a standard that we should refuse to mine for coal if this will lead to a single drop of toxic materials in a watershed.
I dream of a country where political factions are divided between those who see these statements both as wrong, in a similar way, opposed by those who see them both as acceptable.
Instead, we have a country where few people seem to see these both as similarly wrong, and there are two larger groups who see one version as correct and the other as wrong. Their different positions seem to be based on a pre-programmed double-standard. In both cases, the optimal standard in the world we live in clearly involves compromise. The optimal amount of refugee acceptance or immigration will, unfortunately, inevitably lead to some instances of crime involving those immigrants. The optimal amount of electricity will, unfortunately, inevitably lead to some instances of environmental accidents or increases in trace toxins. We accept these compromises as endogenous when it comes to crimes committed by citizens, or when it comes to toxins we release from our backyard fireplace, or the production of solar panels, or the delivery of some fossil fuels within the status quo.
The differences in these positions seem to come from different forms of sectarianism, who have different suppositions about who are insiders and who are outsiders. Outsiders don't get compromises. They get ultimatums.
We will be moving in the right direction if we can somehow break away from sectarianism and move to a political context where the disagreements are between conservativism and liberalism. The great miracle of markets and capitalism has been capitalism's tendency to deal a winning hand to liberalism, freeing the world's communities from their local status battles, within which the potential of the community is held back in service of the protection of the powerful. It is difficult for this miracle to play out if there are no liberals to carry the mantle. Liberals deal in principles, not identities. Liberals are relativists, not absolutists.