If you already know altcoins are scams, why do you join them and blame them for being scams when you lose?
For me, everything has risk, if you have the courage to invest, you must take responsibility for your decisions, don't blame altcoins or anyone else because no one forced us to invest in them. By the way, I don't care if ETH is a scam or not, but I know that it has also brought a lot of profits to many investors, its ROI is not inferior to bitcoin.
If you mean me, personally, I must say 3 things.
1. I bought ETH because I was greedy. I made some money, as I said, then got out. So I don't call them scams because I lost money, but because, especially when NFTs came around, people created literally garbage and sold it for HUGE money.
2. ETH moved to PoS. Since this change happened, Ethereum is a different Blockchain that it used to be when I bought ETH. I don't trust / I hate all PoS blockchains. In fact I only trust and believe in PoW.
3. I don't see bitcoin as an investment, but as an opportunity to change the world order and to achieve a financial world which will be more liberal, without central banks and authorities.
Those 3 arguments are exactly the reason why I sold ETH (having gains) and went to Bitcoin only.