I will not blame when someone sells the Bitcoins they have, because everyone has their own reasons when they sell the Bitcoins they have, maybe it's for personal needs, buying things they dream of, or for whatever reason. Moreover, it is Bitcoin that they have, so it is their own right to what they want to do with the Bitcoin, whether they want to hold it or sell it. But indeed it is quite unfortunate when someone sells the Bitcoins they have for trivial reasons, because if they can they should use other money that they are ready to use, but if they still want to sell the Bitcoins they have, let it be so, it's not our business, and we can't judge them either.
It is a normal process in the market, as an asset simply changes hands, moving from one group of investors to another. Investors buy it at different levels and set their own goals. If an investor bought Bitcoin at 10000, aimed to make a 10x return, and sold at 100000, I do not see anything wrong with that. I understand that Bitcoin has much greater long term potential, and that it would be reasonable to hold it, but there are investors who are constantly searching for new assets and opportunities. And if they see profit, they take it, so that is normal.
After that, they will look for new opportunities where they might earn faster, because Bitcoin is becoming a heavier asset, and to make another 10x, it would have to reach a million. That could take quite a long time, and they might be able to rotate that money elsewhere and get quicker profits. So, everyone has their own strategy, and that is perfectly fine.