It's not really that it protects itself, it's more just logic dictates that is must be impossible to change the future due to the paradoxes that would occur otherwise(unless you get into multiverse stuff).
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I like the "multiverse stuff"
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I have nothing against the multiverse theory, I just didn't want to get into it. Even with the multiverse theory it still doesn't change the future, it just creates a new one in a new universe.
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This is true. However, in many other theories time travel could result in paradoxical situations. These are usually solved by either the collapse of the universe or the avoidance of the situation to begin with.
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yeah the avoidance theory is the one I subscribe to obviously. Of course time travel is probably impossible to begin with.
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There are "loopholes" in the laws of physics regarding wormholes near very high gravity that make it possible.