Due to the rapid progression of fantastically powerful computer networks, this point of no return, the technological singularity, now appears more accurate and imminent than ever. The bitcoin network, for example, has demonstrated exponential growth in total hashrate since it first came online in 2009.
The computer network are not as advanced as you assume they are,almost every network can be compromised as they all have some downfalls even an optimized network will have some limiting factors as it cannot be generalized to all scenarios.