Hatred is the worst of emotions. It is one thing to dislike a person – to take displeasure in someone’s attitudes, actions and lifestyle. One may even be utterly frustrated with certain people, situations and circumstances. Frustration, dislike, displeasure, or even anger, cannot match the rage that ensues with hatred’s venomous emotion.
It is often understood that “Hate” is a detestable attitude / emotion that manifests itself in human [hate] speech. When people hear hate speech they often readily label someone a “Hate-monger.” The (common) universal school of thought is to qualify a hate-monger by what he says – not by what he does.
A Hate-monger can also be a person who does not voice hate speech. A hate-monger can also be defined by a person’s “hateful” actions
Thinking outside the conventional (politically correct) box, a hate-monger can also be a person who does not voice hate speech but whose lifestyle (actions) clearly identify him or her as a person who promulgates the destructive forces of hate.
Human history is replete with hatred’s tsunami type devastations
One does not have to look far [back] into history to identify hate mongers. Hitler readily comes to mind. Recent past history showcases Adolph Hitler’s hatred, turned vengeance, against 6 million Jews, and other peoples. Communist leaders such as Lenin, Stalin and Mao, vented their hate by murdering millions upon millions of their own peoples. Pol Pot, and Idi Amin were more modern hate mongers, who left a trail of blood as evidence of their bigotry of hate against those who stood in opposition to their political paths. Most recently, hate-mongering is personified in the murderous actions of global terrorists and who strap bombs on their children to fuel their maddening and deadly feuds—hatred gone wild at its worst – destroying innocent human lives.
New Testament Christian Scripture contrasts love with hate and notes not only the present destructiveness of hatred gone wild, but also its eternal ramifications:
………He who does not love his brother abides in death. Whoever hates his brother is a murderer, and you know that no murderer has eternal life abiding in him. – [1 John 3:15]
If someone says, “I love God,” and hates his brother, he is a liar; for he who does not love his brother whom he has seen, how can he love God whom he has not seen? [[1 John 4:20]]
Hate-mongering can take the form of policy, agenda and support for the destruction of pre-born life – and posterity. Current day, example:
It is common knowledge, of (then) Senator Obama’s past Illinois Senate record regarding his position and voting record for unrestricted and partial birth abortion. In addition to his abortion position on pre-born human life, he took a grotesque position in favor of allowing those babies surviving abortion to be left alone and die.      What could be more hate filled, hideous, grotesque and monstrous than that? One cultural slogan observes: “The Ultimate Hate Crime" – needless, unrestricted and / or, wanton, "Abortion.”
Granted, the USA president is not another hate-mongering Hitler. No one could take the place of Hitler and his extermination sanction of 6 million Jews, gassed and burnt in Nazi holocaust concentration camps. But President Obama gives his presidential blessings to Planned Parenthood groups which pay for and participate in the unrelenting genocidal abortion slaughter. He has also lifted restrictions of USA taxpayer dollars which promulgate unrestricted, wanton and needless abortions, outside our country’s borders. 
Hitler did not personally gas and load bodies into Nazi oven chambers. Neither does Obama poke and mutilate pre-born babies as they are in their mother’s protective wombs and also those babies imminently about to be born. But he is, as guilty of hate-mongering as Hitler, by virtue of his leadership role in support of the continuing abortion genocide.  
Note: See also: Abortion genocide
1- Barack Obama’s Actions and Shifting Claims on the Protection of Born-Alive Aborted Infants -– and What They Tell Us About His Thinking on Abortion
2- Senator Obama's Voting Record
3- Obama Caught Red-Handed in Abortion Lie
4- YouTube Yanks Video Exposing Obama's Abortion Extremism
5- “Senator Obama’s Voting Record”—bornalivetruth.org
6- Most Americans Disapprove Obama Funding Abortion Overseas: Gallup Poll
7- Obama Flip-Flops on FOCA: Says "Not Highest Legislative Priority," but Continues Extreme Abortion Push
Since April, 114 Children Have Died from H1N1—but 700,000 Have Died from Abortion