The answer you might get from Monero developers is they wished to put a fair cryptonote based currency in the spotlight for everyone to enjoy, because the technology has promise.
Yeah, altruism is always the main motive of clone coins...
With the exception of Bitcoin (and DOGE which was made for the lulz), I don't think many people created coins for the good of humanity.
Regardless of motivations, a cryptocurrency with privacy protections is essential to the survival of any kind of human dignity and freedom. BCN premine was indecent. Monero fixed that crime. I am glad of it, for myself, and for my progeny.
We don't disagree on the need for anonymous currencies. But stealing other's work to capitalize on them and then claim superiority as you throw the original devs from the cliff is indecent / a "crime" too.
You can't correct scam mentality (80% premine) with scam mentality (taking the entire code that others created and saying "oh, yeah, that works great and we fixed the premine").
The ultimate form of programming and hacking, is the programming of the human mind. Few know how the mind is programmed and even fewer know how they are self-programming themselves every day through their actions.
For every action there is a subconscious programming routine that is performed automatically: When you steal, your subconscious observes the stealing act and says "Since I'm stealing, my creative capacities are obviously not very good - otherwise I'd be able to manage on my own... the fact that I'm stealing proves that I have inadequate creative capacities". This is programming the subconscious of the thief into a very strong self-affirmation of limitation and parasitism. Nothing good can come out of that. This dynamic is inescapable in human affairs and it will blow up in some way, at some time.
Even so, Bytecoin (and to a lesser degree clones) is/are useful so that they can up the anonymity game in terms of technology. The market is sufficiently large where everyone can fit in. I estimate that even if 1% to 10% of the transparent market goes anonymous, we'll see 70-700mn market cap for anonymous coins (with current BTC prises). If BTC prices multiply we can also multiply the prior projection.