Thats your opinion, Im ok with that, however I have been involved with them for 20yrs and I dont agree. They are a very "safe" dog if you want a loyal companion, that will guard you with his life, a Bull for me is totally useless and I wouldnt give one house room, doesnt mean other folk dont see them differently though.
Perosnally i wouldnt dream of crossing ANY breed with another, I think Greys, Saluki's, Beddies, etc and the terrier breeds can adequately do the jobs they were designed for without intervention of anything else!