Sorry for bad format, I'm on phone
I think it is safe, 5600 is a CPU that not a lot of people will overclock. However, I insist on being able to physically test the hardware before purchase.
The cooler idea is a good one. You can definitely get a better one for $25. GamersNexus has an article comparing several coolers.
That was an exceptional case, I think with the WannaCry malware. Not something they'll regularly do.