You have proven a few times to us here that you are inept and probably not capable of using your judgement to protect yourself online and need software to do it for you.
1) zen - you need to stop insulting people, else the mods will come and force you back to 68K, or just ban you, im not sure, but one or the other
2) Most users would be happy on a Quadra if it wasnt for the internet. It can do office tasks just as well as anything else with ClarisWorks 1.0

. The only reason we need security updates is because of the internet. If it wasnt for the internet things such as Flash and Java wouldnt exist or would be less prevalent, however this logic also implies that everything would be better if computers didnt exist at all - which is a rather silly position to hold.
3) For most users Intel has become what they need because the developers at Adobe seem totally unable/ cant be bothered to get flash to run on the Mac properly, so we need faster machines to cope with their inability to ship a functional version. Unlike QuickTime, where QuickTime 6.0.3 for OS9 is still functional and even speedy on a 133Mhz 604.
4) The problem with online security is that hackers have a tendancy to try and do major sites, normally they fail, but it just takes 1 inept webmaster at CNN or the BBC or similar to bring large swathes of the Net under attack (albeit not so much for UNIX and OS X systems, because their security model is more "solid" than Windows')
5) zen - you have to concede that upgrading the CPU is out of the reach of most normal users (heck Ive seen people throw out machines because they havent got enough RAM -

- I normally go and buy these as its a simple fix to use them for longer), as is spending $900 on CPU, Video cards, RAM etc to get the most life out of what they have when a Mini costs less and is easier. (I respect you for soldiering on, but most users aren't as dedicated and dont have the time to do this)
6) Older OS releases tend to bring more software compatibility problems with age than security risk, at least outside the windows world (where security issues is a fact of life).
7) You also come across plenty of people who keep their old computers and never even take stuff off them, they just turn them on when they want old data, and even copy it by hand to the new machine out of ineptness
