If denied boarding, can the official check via computer if your visa is up to date ? For example when you last entered that country? [closed]

My friend was travelling from Dar Es Salaam to the UK and does this annually. He is African and has "An indefinite leave to remain" visa. His wife and children live in the UK.

He used Turkish Airlines and was denied boarding the Manchester plane at Ataturk Airport Istanbul when he was at the gate. The Turkish official would not listen to my friends questions. The official said the documents were not adequate and shouted "don't talk" to my friend.
After a very stressful 6 hours and a lot of distressful chatting to other officials my friend begged the police to help him. They organised a flight back to Tanzania using my friends return ticket (which should have been in Jan 2017).
He had no food or drink until he arrived back home. Tanzanian airport officials could not understand the error !

My friend borrowed money and got another flight 2 days later using Etihad Airlines avoiding Turkey, using same documents, no problem arrived in Manchester.

This is a very stressful thing to happen to anyone . How can an Official get it so wrong and cause such grief and expense ? Is there anyway to get compensation for the extra flight money used 950$ or £800 ?
American Aviation complaints dept . Said the official checked with UK on his computer and was given no evidence to help my friend . So I would like to know can they check by computer that my friend had been in Manchester 6 months prior to this visit ? So my question is ... Can an airport official use a computer to check if a traveller has entered a country in the past 2 years ? As that was the issue concerning my friends visa ?

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How do you handle denied boarding?

If an airline denies boarding against a passenger's will, it must:

Make alternate travel arrangements or provide a refund.

Provide minimum assistance (standards of treatment)

Pay compensation for inconvenience.

Communicate key information to passengers.

What does denied boarding mean?

Bumping, also known as \u201cdenied boarding,\u201d happens when there are more passengers scheduled to fly on an airplane than available seats. The business practice of bumping is not illegal.

What are the reasons for denied boarding?

Non-Discriminatory Reasons For Being Denied Boarding

Being intoxicated or under the influence of illegal drugs.
Attempting to interfere with the duties of a flight crew member.
Disrupting flight operations or engaging in unruly behavior.
Having an offensive odor that is not caused by a disability or illness.

Can airlines refuse boarding?

Yes unfortunately airlines can refuse boarding or remove a passenger from a plane for any reason at all. Even of the passenger has paid full fare for the ticket. Passengers do not have many rights when it comes to being on an airline.

What if my B1/B2 visa gets denied?

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Sharad Bhat, Prateek Katyal, Pixabay, Pok Rie