Victims of Trolling

When I hear the word trolls, the first thing that comes to mind is an animated troll with crazy, colorful hair.  When I hear internet trolls, I automatically think about a person who seeks attention or backlash from a person that they are trolling.  Trolls are attention seekers, those who try to cause tension just to entertain themselves or to even mess with someone just for the heck of it.  Trolling is found all over social media and is made public for anyone to see.  My advice to victims of trolling is to, first, try and ignore it and if it doesn't work then delete what you posted, maybe even report the troll.  If those don't just delete your account or the app itself, so you won't be reminded of these comments and move forward.  Try having no association with them whatsoever.  My question is "why do people post certain things without an expectation of those responding or opposing their views?"  They should either protect their posts or post less carelessly.