I totally believe that as an intending B1-B2 visitor to the US, it is the prerogative of the host country (as in this case the US) to allow or not to allow a visa; both morally and legally. The unchallenged discretion of the embassy where one applies:
A refusal without assigning a reason is excellent as long as one is not assumed to be a liar both morally or legally if we really have any care for human values.
Moreover,
“The first sentence of INA 214(b) states that: "every alien (other than a nonimmigrant described in subparagraph (l) or (v) of section 101(a)(15), and other than a nonimmigrant described in any provision of section 101(a)(15)(H)(i) except sub clause (b1) of such section) shall be presumed to be an immigrant until he establishes to the satisfaction of the consular officer, at the time of application for a visa, and the immigration officers, at the time of application for admission, that he is entitled to a nonimmigrant status under section 101(a)(15)."
The US Law 214 (b) presumes every nonimmigrant applicant who goes for pleasure and to meet friends….to be an intending immigrant……….etc etc!
So the moment you apply for a US visa under B1-B2 in DS-160 the Visa officer is bound to consider you a liar applying for nonimmigrant visa under this category, until you can prove it otherwise.
At interviews, the DS-160 becomes the main document and what they ask you becomes the only source, beside prior intelligence etc…etc, they have on their computers…; for the Visa Officers to develop their assumptions to confirm or reject this immigrant category and decide to give or refuse the visa (all done within a span of around five minutes).
Morally, it is fine to refuse a visa and also not give the applicant any reason why. So when the VFS help desk says in their public response “…….visa refusal is based on the discretion of the Embassy.” It is good.
Legally, when you are not even asked to prove your links to your home country and the Vo has a free hand to ask or not even attempt to ascertain this where is the transparency in all this by US law under section 214 (b)?

Further, when the Visa officer is already bound by law to assume all nonimmigrant applicants as intending immigrants, and he hardly has time, where does justice and human ethics go? And when there is no appeal in a US court or any US administration process against this biased section 214 (b) of US law…..is it fair to the applicant?
In any event, the embassy Visa officers are forced into a decision due to law, short time they have and the quantity of people to certify the applicant to be a liar when they reject the applicant’s visa and provide him with the 214(b) booklet as reasons that he is an intending immigrant…..!
Refusal of a visa is no insult; but this certification of applicant to be a liar definitely IS.