Malware & Virus

ok, I'm old school born in 1959, but a little new to Ethereum. If I can buy and use Ethereum to have complex code hashed by large numbers of decentralized computers, then how can anyone stop malware from infecting those computers simultaneously and the Ethereum nodes as well. Not like a DDoS attack of sorts but more like Stuxnet or something worse? How does the Ethereum community protect itself from malware?
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