Is there a word that means "unnecessarily evocative"

Yes, I'd call what you are describing "lurid:"

lu·rid ˈlo͝orəd/ adjective (of a description) presented in vividly shocking or sensational terms.

Another option is "sensationalistic."

sensationalism [sen-sey-shuh-nl-iz-uh m] noun 1. subject matter, language, or style producing or designed to produce startling or thrilling impressions or to excite and please vulgar taste. 2. the use of or interest in this subject matter, language, or style:

"The cheap tabloids relied on sensationalism to increase their circulation."

Let me know if that helps.

editorial bias

Wikipedia:Neutral point of view (NPOV)

This page in a nutshell: Articles must not take sides, but should explain the sides, fairly and without editorial bias. This applies to both what you say and how you say it.

All encyclopedic content on Wikipedia must be written from a neutral point of view (NPOV), which means representing fairly, proportionately, and, as far as possible, without editorial bias, all of the significant views that have been published by reliable sources on a topic.

without editorial bias and from a neutral point of view

In a single word, it's called being impartial.

Language that has “strong emotional implications and involve strongly positive or negative reactions beyond their literal meaning” can be called loaded:

In rhetoric, loaded language (also known as loaded terms or emotive language) is wording that attempts to influence an audience by using appeal to emotion or stereotypes.