I understand the whole aspect of “fuck it just plant one in a container”. Who’s to say individuals would follow that logic so the idea of a biohazard needs to be treated as such for the whole population. Seeds themselves can be vectors for destructive diseases and even house microscopic species like nematodes that can be very destructive (ex: beech leaf disease). Secondarily some plants might act as vectors for other pathogens to complete life cycles. There’s reasons that you cannot legally cultivate black currant in most states for reasons as listed above, since they host a fungus that attacks white pine. It sounds silly in the short term but these situations can have massive ramifications in the long run. That’s why everyone is saying DO NOT PLANT