"You know what? It's better then worthless little nations constantly locked in a power struggle. What's the use of going independent if things go downhill from there?! "
Strawman fallicy. Or perhaps False Dilemma. Our choices are not "Be an empire" or "be a tiny worthless country."
"And anyway, there is NO country that's a true democracy: The US itself is a republic, and a corrupted one at that. Now, read the case of Vermont's cause for a modern secession, and see for yourself the potential for this..."
Well, yes, but as Winston Churchill said (I may be paraphrasing here) "It has been said that democracy is the worst form of government except all the others that have been tried."
In other words, Human Beings, being imperfect, do not have it in them to run perfect governments. Modern democracy (which yes, is a republic, or sometimes called a representative democracy) is also imperfect and prone to certain failures, of which the US demonstrates many. However, because it is a democracy, it is capable of peaceful institutional change as a matter of course, and very few other systems can achieve this.