What arguments can you offer to support the claim that they are useless?
I'll start by stating my own arguments. Films are just as much a part of art as books are. Just like painting, architecture, music, and any other field of culture. And just like other areas of culture, films develop a person. Firstly, they convey some kind of information, just like books. They impart knowledge – and knowledge can be gained from anywhere. After reading a good book, you reflect on its meaning, re-evaluate something, and change something within yourself. Who said that this doesn't happen after watching a good film? The main thing is to convey the essence. This can be done in any form; whoever is skilled in a particular area can use it to convey their message. If you're good at drawing, create paintings and convey a message through them. If you're good at writing poetry or books, express your thoughts in written form. If you have a good ear and can write music, compose music. If you can demonstrate your idea through a real-life (or fantastical, it doesn't matter) example and visualize it, make a film.