There are a few points I want to contest though. Can you even consider something a forgery if the original work was up for grabs anyway? These forks's developers aren't really stealing, but the moment they claim that their altcoin is the original, like what Bitcoin Cash does or what Segwitx2 was planning to do, then it becomes stealing.
Either way, I believe most of the forks are harmless. They get little to no miner support so they're not really stealing hashpower, and most people only claim them to dump them for even more Bitcoins. I don't like them, but I don't believe they cause any long term effects.
Forging is plagiarism. you think bcash will have any value without using bitcoin name?