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Imagine getting an apartment and finding out that you can't move around the existing tables or chairs, simply because the landlord said that "it's prettier that way." Or imagine buying a car and being told that you can't attach new rims, for example, because the original designer(s) of that specific model thought that they looked good enough as they are. If you paid for the original "Mona Lisa", you can hang it on your wall, burn it, paint over it, or tear it, as you please.
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You've obviously never rented anything...
If you rent an apartment then you are not allowed to paint, wallpaper, or otherwise alter it. If you lease a car then you are not allowed to put new rims on it or fit a new stereo. If you rent a piece of artwork then you are certainly not allowed to splash paint on it or set it on fire.
Most software is not a "buy" model, it is a "lease" model. If you "buy" Microsoft Word then you do not own it - all you've bought is a license to use it in certain ways. The licensor has the right to set out those certain ways; the licensee (AKA consumer) has the right to spend their money elsewhere. The licensee does not have the right to violate the terms of the agreement.