I don't know what bible they are using to justify this, but mine says this:
"Gen 2:24 Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh."
Nowhere in that verse does it say "unless they aren't part of the way ministry". They have broken apart a "one flesh" union where they had no authority to do that. If that's not evil I don't know what is.