To repeat what I said above, there comes a time when you simply have to start having faith in yourself and your security software.
Doddie, using your philosophy I would never get into my car to go anywhere because every time I get into my car there is always a very real chance that I will be in an accident and get killed, one simply has to have faith.
Using your analogy:
Everyone who drives knows that there is a very real chance they will be involved in a collision at some point, I'm not advocating that no-one should drive but they should accept that as soon as they sit in the drivers seat they are at risk.
How they mitigate that risk is up to them, for instance some might wear seatbelts (firewalls), others may use parking sensors (anti-malware software), but to blindly accept that even after you put on a seatbelt and activate your parking sensors means your vehicle is now 'safe' from collision and you should have faith 'in it' would be stupid. [I'm not implying anyone on here is stupid.]
As a driver i know the risks i take every time i get behind the wheel, i also know the risks i take when i connect to the internet, they are not dissimilar with the exception that the only thing likely to be killed connecting to the internet will be my data.
I still drive and i still connect to the internet because i enjoy both but i do both with my eyes open.
As my original comment about imaging is now heading down the path i originally feared, I'm done with this thread.