Do the research, look at the statistics. You'll see that as killers, those two breeds are much more prevalent. The numbers speak.
In other words, back up you words with facts.
I have trained and bred dogs for over forty years.
Army dogs, police dogs, hunting, tracking, seeing eye, rescue, guide dogs.
I don't have to look up anything.
Breeds used in police and security work top the bite list, for obvious reasons.
After that come Cockers and poodles and other lap dogs for a long way down the list.
Unless they are untrained and mistreated(untrained IS mistreated) Rottweilers are a very reliable and stable breed.
That's only because they have the power behind the punch. If chihuahas were 150 lbs, they'd be killers also! There are bad dogs in every breed, some made that way, some are just bad dogs. Unfortunately, dogs with power to kill are the ones that get the bad rap.