AviK, red strings מאן דכר שמייהו? Red strings are definitely not a mitzvah, and there is no reason to suppose they give any protection, except that people have been saying so for at least 1500 years. A superstition doesn’t become true just by surviving for a long time. But mezuzah is a mitzvah, and every source from the chumash through the shulchon oruch says it protects.
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