first, there are cleansers out there, ready to throw the baby with the bathwater. This verse simply states that only Christ can do the right job. Hitler was an ethnic cleanser, communists are cultural cleansers who have their own "logical" final solution, not an outright death camp, but a function and a time of death most probably after the function ceases, through purges.
God's "final solution" is in Christ and as seen from the heart. Mind you, we still need to recognize the "bathwater from the baby" so as not to mistake love of the person for love of or indiference to sin. And in fact, sin, when it favors the body over the soul, is ensentialy favoring the body, a cleansing act done at the expense of fundamental concerns, kind of like selling cars with a nice body but no engine.
It is much more important to keep walking, whereas stoping for sake of cleansing kills the "baby".
Let us take for example the Civil war. Most people in the South did not own nor fought for slave interests. Yet people today want to get rid of the Stars and Bars as if it was the same as the German Nazi Swastika flag.
The Stars and Bars is sinful, but we must let it live, for the flag represented a nation of good hearts that had its own opinions on how to deal with the sin of slavery. The Nazi flag on the other hand was fundamentaly racist and utilitarian by definition.
In the end, God's trust in us depends on whether we let the heart see. Those who do not make the difference between the dirt seen with the eyes from the dirt seen with the heart are often very confused as to whom to trust. Anybody with a good heart should see that Christ confirmed that matters of heart are not spread scientificaly, with the iron and Jihads. Matters of heart are spread with the heart. God rewards those who walk with Him, and not those who Jihad for Him.