It may not be reasonable to blame C3's demise on Tango, I agree. However, it is a FACT (not an opinion) that the competition commissioner had decided that Tango was illegal, and was aint-competitively aimed at AC. So, althought they were not responsible for the demise of C3; the finding was that they WOULD have contributed to the demise of C3 further down the road, had they not collapsed anyway. Competition is good and the idea of the new LCC being a wholly owned but separate subsidiary (i.e., able to have lower costs) is at least a legal idea because they can compete using realistic fares. But this was not the case with tango, in that they were clearly (in the opinion of the government) selling tickets at below cost to hurt C3. As you know, this makes it a fighting brand and was therefore ILLEGAL. So I disagree with you about Tango and think they should be put to an end so that someone in the East will at least POSSIBLY have a chance to make money, other than AC. The new carrier , though, is another matter. Though I don't expect to be a fan of it, I don't think there's anything unethical about it - yet, and if it's properly and fairly run, then we should welcome it.
Next flight.... who knows.