Sergio,
I clearly asked not to take this personal. And yes you are correct jets could be dangerous even if flown clos and at sight. This is exactly why this part of the hobby needs extreme cautiousness and wise judgement as well as common sense. To say the least, a failure of some sort could start a fire and degenerate seriously. The bad publicity is simply not worth the trouble.
Enjoy the hobby and minimize the risk that's the name of the game...
Hope we are able to convince you...