By that notion, the fact that almost all home locks are easily pickable and glass windows breakable is also insane. There's tons of valuables behind almost all of these!
We found meaningful ways of disincentivizing theft, which turns out to be largely sufficient even in face of fallible security. The exact same applies to card data in the hands of merchants.
Take that logic and apply it to crypto and hopefully that'll help you understand why crypto enthusiasts believe in it.
The fact is that we can and do find ways around flaws in a system. Crypto folks just think that a crypto foundation is better than the current foundation of our financial systems.
We found meaningful ways of disincentivizing theft, which turns out to be largely sufficient even in face of fallible security. The exact same applies to card data in the hands of merchants.