I think this is incorrect, as much as you can summarize the thoughts of an informal entity such as "the community". The community did acknowledge the possible harmfulness, it didn't refuse to believe it as you say. Changing the emission curve was simply deemed to be even more harmful.

..and I am out now.

+1 I would definitely not be here if the emission was changed. It doesn't matter how hard the reality is now it means there is no real demand for Monero and lower emission would not solve this problem we would be fooling ourselves. Also I'm not concerned about concentration, I got my stash

Jesus AP, I wish I had your job to be able to fork over that kind of cash whenever I wanted... how are you able to survive bills and food/alcohol expenses when your throwing that much money into cryptos?

It does.

Should I sell my XMR to prove to you that I don't like the concentration that is happening?

(I also don't like that nobody even recognizes this is the problem. As with price, today it is 0.3734 EUR/XMR, twelve days ago it was 0.3735. That one is holding steady.)

 
 
If you remember the early days, those with excessive amounts of BTC were incentivizing others in BTC.  1000 BTC for this project, 1000 BTC for that.  As long as you could prove you had a legitimate way to advance the currency, there were rounds of investment capital being paid into the ecosystem in the currency. 
 
This has a two-fold effect: it propagates the currency while also giving people a way and incentive to build it up.  Consider making some XMR investments into projects.  Remember: BUIDL, not HODL.   

Early on, Roger Ver was an prolific Angel investor: BitPay, Blockchain.info, Kraken, Safello, Purse.io, ShapesShift.io, Coinsetter, the Bitcoin Store, BitInstant, and dozens of other companies all received money from Ver. I hope I am in the position to be an angel investor one day.

This may be (or turn out to be in the future) a problem, but I don't think it is the problem. Extreme concentration should typically produce a highly defective market cap, because those with the oversized concentration can set whatever price they want (Exhibit A. BCN). We aren't seeing that happen in XMR as far as I can tell, unless the oversized portion is ensuring a defective market cap on the downside, which seems counterproductive to wealth preservation.

Or maybe they hold it low so more new people can buy thus lessening the concentration, except new people often don't want to get involved in a declining market.

Or maybe none of the above.

Rpietila has done quite a lot of that already. Next to Crypto Kingdom, he also donated quite a lot to the dev team.

 
 
Yup, except if I use any capital gains to support transhumanism, it might one day be a YOLF bet.    

Also, I filed this today over on the Monero subreddit.