Plain wrong. Counterfeit goods are a major loss of revenue to the brand names - just as alt coins will seriously undermine the value of Bitcoin
Not comparable. To the consumer, a counterfeit pair of Adidas shoes is just Adidas shoes but cheaper (and perhaps with a lower quality or slight alterations).
To a Bitcoin user, an altcoin claiming to be "Bitcoin" is simply lying. It's like someone picking up a piece of paper, writing 1,000,000,000 USD on it and saying "this is worth 1 billion US dollars".
You know perfectly well that if someone is talking about 1 million BTC, they're talking about the correct chain, not something that was made up on the spot.