Welcome to the Apple Support Communities
If you are referring to continuous Flash updates, that's because of one reason: security problems. This plug-in is full of security bugs, and slowly it's being replaced by HTML5. It's so important to install those Flash updates if you don't want to put your computer in risk
You think these are the only/main cause of security issues?
As a developer let me tell you it is far from the case. Most security issues are a direct result of user carelesness.
Let me give you an example....
I'm just a loley ole developer, no one special, but I do create many web apps/mobile apps, and many are free, and widely distributed.
One example is a social networking web app based on html5 and google maps api - a gps enabled social web app.
This is just one example of hundreds, I offer free hosting services truimagz.com/host and mush more.
Anyway, the point is... do you have any idea how many people sign up using an email adress and their actuall email password as their login info?
I, just some schmuck, have access to over 50,000 email accounts and passwords at any given moment. Thank god I'm trustworthy eh?
Just food for thought.