Why is Mars said to not be well placed in 7th house?

why? because mars in libra in detriment and 7th house governs relationships and relationships needs diplomatic skills and mars knows only headbutting. that's utopic though, be diplomatic, get along with everyone etc. imagine this scenario; mars in a fire sign and 7th house and receiving positive aspects from sun, pluto and jupiter. now, this guy will kick ***. he can't be bothered with diplomacy and stuff. he will tell you whatever he wants you to do once and then force you to do it physically if neccessary. he will be heartless, he will have this black aura about him, intimidating and even very sexual. so, yeah, the guy is mean, evil and a womanizer. but it's working pretty good for "himself". he will rule in highschool, he will be in a football team, kick nerd arses etc. maybe he can never be a "good politician" but he can be a good athlete, good soldier and many other things that need guts and heartlessness. so, yeah, not well placed for society or this utopic world astrology long for. pretty good placed for himself though. ..... lol edit; just looked people with 7th house mars; Barack Obama Nicolas Sarkozy Ségolène Royal Malcolm X Jacques Chirac Ronald Reagan George Washington but also Adolf Hitler. maybe i was wrong. it makes you politician, mars drives you to some higher place where you can change things structurally? but hey, i wasn't. i was thinking that's utopic, remember? mars in 7th house should just mean you will be further driven to physically change relationships/partners you have, your allies etc. astrology wants you to be a nun, a pacifist, a peace lover whatever but in reality things are not working like that so mars should be good in 7th house unless badly aspected, if so, then, hitler. editmania; no, that's not really what astrology wants. but most of the astrologers interpreting things that way. you can't blame physic laws if a physicist invents atom bomb right?