I'm finding it harder and harder to understand why I should ever install software that hooks into my OS on multiple levels and opens holes to the outside world without any notification in the name of "security"
One obvious difference is that the consequences of mistakes can be higher for STDs then for infected computers, but that's the analogy.
http://decentsecurity.com/about/ (This entire website)
https://www.microsoft.com/emet (for Windows)
https://paragonie.com/blog/2015/06/guide-securing-your-busin... (basic web security advice for non-technical people)
You don't need AntiVirus.