I'll assume you meant "right", not "tight".
What about it isn't right? Did you not purchase your device? Did you not pay for it? Why exactly is it "not right" for someone to have full access to something that they own?
The equivalent is that you buy a house, and the seller says "Look, I know you bought this house. But these two rooms are off limits. Im locking them up tight."
Does that sound right to you? Because that's essentially what you're arguing is "right".
This isn't generally true. It is illegal to circumvent digital copyright protection in the U.S., even if it's on a DVD player you bought and own. But jailbreaking is explicitly legal in the U.S. (though you could void your warranty I've heard). The house analogy, like all analogies, doesn't prove anything and could only be used to make a point easier to understand, plus it's a bad analogy anyway.