Normally I would agree with you, but the primary lobby behind both of the bills was Bayer (née Monsanto), with backing from several of Iowa's industrial farming organizations. They launched a giant ad campaign to "control weeds, not farming" alongside their bill to influence opinions. Cancer, nitrates and pesticides are at the top of everyone's mind in the state these past couple years, so having the pesticide giant try to swoop in and put a bill in place that would prevent Iowans from suing them feels like that same kind of seagulling behavior you described in another comment.