So Russia has a supply and pipelines and can control whether the gas supply flows or not. If it flows they make money, or for political leverage they can slow/turn off the flow. That is a position of power, a win/win position.
If Russia blows up the pipelines they have no leverage and make no money.
Large swaths of Europe lose through this attack by the loss of fuel supply just as winter approaches.
I can't see any reason either one of the above would want the destruction of a mutually beneficial piece of infrastructure.
