You are right; the arrest might be legal and even morally justifiable.
However, I still argue that wanting to provide secret communication (which Telegram actually doesn't do) is not abetting crime or helping it more than any other product.
In fact, in my humble opinion, it's the opposite: Private communications are a countermeasure against the natural tendency of governments to become tyrannical, and thus maintaining one is an act of heroism.
> Private communications are a countermeasure against the natural tendency of governments to become tyrannical, and thus maintaining one is an act of heroism.
That's an easy enough statement in the abstract, but again it doesn't speak to the case of "Durov knowingly hid child porn consumers from law enforcement", which seems likely to be the actual crime. If you want to be the hero in your story, you need to not insert yourself into the plot.
However, I still argue that wanting to provide secret communication (which Telegram actually doesn't do) is not abetting crime or helping it more than any other product.
In fact, in my humble opinion, it's the opposite: Private communications are a countermeasure against the natural tendency of governments to become tyrannical, and thus maintaining one is an act of heroism.