Well because Ethereum was open source we knew from day one that the protocol is very buggy and has a lot of room for hacks like the ones you mentioned. The fact that nobody listened is their own fault so we can't really mention those breaches in this context since they were already expected.
And they keep advertising some fake decentralization now that they fully switched to Proof-of-stake model, and on top of everything they are not censorship resistant blockchain.
Ethereum is now mostly controlled by few individuals, corporations and exchanges, with 25% of their blocks being OFAC compliant, as everyone can see on website mevwatch.info.
This number is constantly growing, and it doesn't really matter anymore if they have wallets and everything else open source, when they have protocol level censorship.
Let's learn some lesson from this shitshow fiasco, and let's not allow something similar to happen with Bitcoin.