I don't know what you mean by "pasting and altering." I have not seen any "convert to lower case" utilities, but I'm sure they exist, since they would be trivial to write. Such utilities would fix a problem that never should have existed. If the standard key sequence to start caps lock had always been, for example, Control-Alt-Shift, capitalization accidents would be rare.
There are utilities that in effect shut off the caps lock key, so you have to physically hold down the shift key to get the same effect as caps lock. AFAIK that's as good as it gets, short of removing the damn key physically.
Whoa, dude! It's been around for maybe 25 years in Word. I know it can be tough keeping up with the rapid change of pace in computer software. ;>)
And, if you accidentally type in all lower case, you can just as easily change to SHOUTING CASE with a click.
In Word, all you have to do is use shift-F3 to toggle between caps, initial cap, or all lowercase. Plus, if you accidently hit the caps lock, many Microsoft programs will automatically turn it off and fix your typing the moment you type two capital letters in a row. It's a bit of a pain if you mean to type in all caps.
I'm not going to complain about Microsoft products, I find them intuitive to use. Apple, on the other hand, I always found user-unfriendly. I'd had an iPad for several months when my son looked at it and saw that I had just about every app on it running. How was I to know that turning off an app on an Apple product isn't as simple as clicking a little X in the corner? It's actually fairly complicated to turn off an app on the iPad--far more complicated IMO than hitting ctrl-alt-del to log in on some systems.