First, people in America can't own guns that fire '10 rounds a second' without a class 3 firearms license, which is very rare. Such guns are basically never used in mass shootings.
Second, depending on who you need to defend your home from, you may want such a gun. For example, if government or government sanctioned groups are a threat. An example of this is the killings of white farmers in South Africa. Is not just about burglars, it's about gas chambers and political threats. Always has been.
Finally, redefining safety as freedom is a truly absurd abuse of language which wipes out a critical distinction that has been heavily discussed for a long time. If this is what it takes for you to make your point make sense, your point doesn't make sense.
Just admit it. You want more safety. You're willing to give up freedom (or rather, sacrifice the freedom of others) to get it. No need to play ridiculous semantic games to pretend there are no tradeoffs here.