|In fact, malware these days is almost entirely financially motivated (with a few political agendas thrown into the mix, for good measure).|
Malware authors have moved away from the "I wrote this because I can, give me props" to organised gangs with sophisticated hierarchies, literally in the business of spreading malware, distributing spam and general botnet activities (DDoS, BruteForcing etc).
Ask yourself, what money is there in actually damaging a machine? The idea of malware is to (attempt to) stay silent on your machine, and cash in on your blissful ignorance of their existance.
With the exception of true viruses (parasitic infectors, which can irreparably corrupt PE files) and Ransomware (encrypting data and demanding payment for the decryption key), most malware these days won't actually touch data per sé.
I hope this helps, any more questions, please feel free to private message me.