never--never---ending idiots in building

last night the drunken indian and his girlfriend came home around nine, with their usual witty banner: "f---you...get in...i'll get in when I want to...get in the house...you don't own me." 
The above weekly nonsense, for last ten years, is at least comical, BUT, last night I heard upstairs idiot, he of the paintball/pellet gun shooting at police car from his window, say something about a cat before he opened his door----with today I finding a 2 foot long rose thorn stem on the roof where I feed the homeless cats outside my 2nd floor kitchen window.   A couple years ago a 3rd floor homeless lowlife bunch threw their cigarettes and some cheese dip on my roof.
Lemonade from lemons: the millionth and one reason for me to leave this building.  Now, I have upstairs idiots to worry about, and maybe wind up yelling to.  You really have to be nasty/hateful to live here among such lowlife idiots who think they are so smart---with me being too weak.
(Days ago I noticed the upstairs window was open a few inches, in cold November; upstairs lowlifes to eventually be the cliché of stiffing the electric company, cause they have electric heat)
With a photo of thorn stem I broke in half for garbage.