Asa, you didn't step on toes, especially mine, and you didn't open a can of worms because that has can has been open for some time and the worms are escaping! What you posted was your thoughtful, logical explanation of how some people feel about this sizzling issue, and I for, one agree with many aspects of your discourse. In any case, there is simply not enough long term scientific study done on many non native species brought in to the country to determine whether they WILL become invasive, or whether their importation will prove detrimental to our already fragile ecosystem.
On to another subject... xerxes just released official reports on Western Monrarchs; 29,000 in the last year, 2,000 up from the previous year, but in overall population counts of many years of counts, still in decline. No official reports regarding Eastern Monarchs; Mexico states increases at the Eastern wintering grounds, but this not official information. Chief causes for declines listed as the lack of milkweed, pesticides, and no big surprise to me, they listed climate change this year, stating that climate change has greatly affected the times and actual migration route changes, especially in the spring migration routes returning from the wintering areas. I noticed a significant route change in my own area for the Easterns traveling to Mexico in the fall, and I was dismissed and poo pooed by nearly everyone I talked to about it.