My suggestion to move on and let someone else take a fresh approach to the problem was given in your interests not the hobby in general, knocking the American way, or the state of the union for heavens sake. Seams like you just need to get back to having fun, as this hobby should be. You sound like you have already gone over the hill with Horizon, and are not inclined to approach the engines problems from a technical standpoint, but just want the problem to go away. They don't on their own. Engines are fairly simple devises, but sometimes, for whatever reason (always a reason) some are more temperamental than others. Virtually every engine out there has has cheers and jeers.
As some have stated very well, a person should not have to take a loss on something bought new in good faith that didn't do what it was supposed to, but, if you want to fly, instead of supporting the shipping industry, and I'm thinking you do, why not move on. Lots of choices.
As for gassers in general, lets not start condemning them all. I have had many brands over the years and never had one I couldn't use. Some I like better than others for ease of operation or power output etc, but in general, they are just so simple, even I can make them work
. Gas, spark, and off they go. Always found a good reason for not having either. The last problem I had, even though it appeared to be carburation, turned out to be a bad ignition box (replaced by a reputable company for free even though I am the second owner). Dealing with people is a lot like landing an airplane. The approach is very important to a smooth landing.