GMO soybean seeds don’t “destroy all others”. Soybeans don’t cross pollinate, which is why it’s so easy for Monsanto to prove when its seed stock has been pirated.
Except the high seas were not involved, therefore there was no piracy... furthermore, the farmer clearly made a legal purchase [from the storage-facility*]... to call these 'piracy' or 'theft' is to advocate the wholesale destruction of all property-rights: in particular there could be no legitimate re-selling of 'used' items if the company prohibited it.
* -- It does not matter that the other purchasers of this seed "normally use it as feed".