It's probably not your intention, but I greatly dislike this argument, as it's similar ones were made to justify previous inhumane practices that were legal before the conclusion of the US Civil war.
If manual labor is required for agriculture, let the market absorb the real cost and pay the workers the correct wage instead of exploiting them.
If manual labor is required for agriculture, let the market absorb the real cost and pay the workers the correct wage instead of exploiting them.