This rule is also founded in reason.

If the committee, after a due inquiry into the character of the applicant, find the result so disadvantageous to him as to induce them to make an unfavorable report on his application, it is to be presumed that on a ballot they would vote against his admission, and as their votes alone would be sufficient to reject him, it is held unnecessary to resort in such a case to the supererogatory ordeal of the ballot.

It would, indeed, be an anomalous proceeding, and one which would reflect great discredit on the motives and conduct of a committee of inquiry, were its members first to report against the reception of a candidate, and then, immediately afterwards, to vote in favor of his petition.

The lodges will not suppose, for the honor of their committees, that such a proceeding will take place, and accordingly the unfavorable report of the committee is always to be considered as a rejection.
Another reason for this regulation seems to be this.

The fifth General Regulation declares that no Lodge should ever make a Mason without "due inquiry" into his character, and as the duty of making this inquiry is entrusted to a competent committee, when that committee has reported that the applicant is unworthy to be made a Mason, it would certainly appear to militate against the spirit, if not the letter, of the regulation, for the lodge, notwithstanding this report, to enter into a ballot on the petition.
But should the committee of investigation report favorably, the lodge will then proceed to a ballot for the candidate; but, as this forms a separate and important step in the process of "making Masons," I shall make it the subject of a distinct section.
Section VI.
_Of Balloting for Candidates._ The Thirty-nine Regulations do not explicitly prescribe the ballot-box as the proper mode of testing the opinion of the lodge on the merits of a petition for initiation.