system
Given the following post, respond as if you're commenting on Reddit:
human
[Dark Souls] Why is Pyromancy "Distasteful?"

Is it just the result of politics(anyone can learn pyromancy, so it's harder to keep it out of the hands of the peasantry), or is there something worse about it?
gpt
Pyromancy is the magic of life, uncontrolled and barely even understood. Laurentius, a practiced pyromancer, hardly understands it himself. He's only able to instruct you in the most general sense, sheepishly admitting that even he doesn't fully understand his own magic and is just repeating what his own master told him, who was himself repeating what HIS teacher told him. It's not established and codified, like miracles, nor is it studied and researched scientifically like sorcery. It's wild and most people tend to find that unsafe, just like most people would see a flame as a danger rather than a gift. They can't see the forest for the burning trees, you might say. The people who see promise in pyromancy also tend to be outcasts and loners specifically because of this line of thinking, which only affirms society's bias against the whole thing.

Because of this I'd say it's actually not possible for most people to learn pyromancy. They just don't have the head for it. Even your own character has to be given a flame to start with (unless he was a pyromancer himself), rather than ever being taught to make his own. Hell, it's possible Laurentius got his flame from his master as well, which would explain why he can't teach you. 

Also, and this one is kind of a stretch, but pyromancy shares a lot in common with Chaos magic; the magic of demons. Now, most people (read: just about everyone) in the Dark Souls universe doesn't know the story of the Witch of Izalith. If they have heard of her, it's likely an extremely edited version of her role in Gwyn's ascension. But they DO know about demons, and looking between the two can likely form the connection between them and pyromancy, even if it's not ENTIRELY true.