meh, bridges get constantly burned and rebuilt between allies and enemies both - just another day really

If a bridge gets built then destroyed, built then destroyed, built then destroyed and so on, people will stop using it. They'll also stop trusting the bridge builder.

You run into trouble if someone manages to set all of them on fire at once.

People all over the world are already building new bridges to places like China, so even if the old ones are rebuilt, they might get substantially less use.