Not everyone has the same amoiunts of common sense, thus just one of the reasons we have laws that, e.g. protect the "lambs" among us, e.g. those borderline, or clearly, mentally challenged = ~10% of the entire population, per bell curve. And experience/learning affect each of us differently too as we deploy "normal" reasoning abilities to make decisions.
This news article's situation really is exactly why we have judges, juries, and the legal system we have chosen. We (news-hounds in AF w/ spare time
) get to read the brief news article but we don't know any of the rest of the relevant facts. The judge & jury will consider the actual case's individual and provable circumstances/facts. Mere onlookers (us) just get to weigh-in with some of the reasonable/likely possibilities, but any of these possibilities might be the actual case (or, it can easily be that there is actually some other, unconsidered possibility). So....
Scenario 1: Seller is not at all responsible, i.e. Buyer is 100% responsible, because seller ascertained that the buyer is demonstrably "smart enough" and/or "experienced enough" to understand and accept the trade-offs of this TV-TT combination,
Scenario 2: Seller is partially responsible (jury usually apportions how much) due to e.g. seller recognized that the buyer had an impairment in the "smart a/o experienced enough" areas so seller should have delayed, or even declined, the sale pending correction of the concerns,
Scenario 3: Seller completely responsible, perhaps even criminally so, when there is demonstrable seller wanton/reckless disregard/gross negligence (or worse: malice, which is hard to prove, but not impossible).
IMO, even with its flaws, I'm glad we have this legal system where each case will be decided on its individual merits and law (i.e. not decided by the merely gruntled or disgruntled onlookers).