Answered by Shaykh Amjad Rasheed
I work in a commercial store where they sell things that have no Shariah-recognized benefit, such as radios and televisions. Are my earnings lawful (halal)?
It is clear that such appliances can be used in lawful and unlawful ways. Anything that is such can be sold, and the earnings from such sales will be lawful.
The exception is when the seller knows [with certainty] that this buyer will use such items in an unlawful manner. In such a case, it would not be permitted to sell such items, because it would entail assisting them in sin and such earnings would be unlawful.
When one is uncertain of the buyer’s intention, it is permitted to sell such appliances and the earnings are lawful.
It is best for a Muslim to avoid selling televisions in the first place, because of the obvious harms it entails, even if there may be some odd benefits.