Your own situation wouldn't be different if you had alternatives to Apple's store. Apple can even market their own store as the one with higher quality apps and promote their safety guarantees. Applications from another store wouldn't have to be less "safe" (depending on your definition) as other iOS applications, they would still use the same sandbox system and all the other standard APIs. You can always decide to stick to one store and not care about the rest.

Considering the fact that you prefer Apple to block you from other options: it doesn't follow that they should do this to everyone, just that you would still pick that option if you had the choice.