Because companies are reactionary structures of power, they often act out of fear of losing control, not out of data or reason. It's easier to lobby governments for harsher copyright laws instead of modernising business model.

There are many counter-examples.

Gabe Newell (Valve co-founder) famously said:

"Piracy is almost always a service problem and not a pricing problem."

Jeff Bewkes (CEO of Time Warner) famous quote about piracy:

"Game of Thrones being the most pirated show in the world? That's better than an Emmy."

Radiohead released their In Rainbows album as "pay what you want", directly online. It generated more revenue than their previous label-backed album.