The RPG.SE meta question asks whether the downvoted answer should be deleted to prevent it from appearing at the top of Google search results, but all the answers there so far say "no". The reasons cited for this include the fact that the answer does not technically meet the criteria for deletion* as well as the idea that the SE community should not subordinate its behavior to the whims of Google's algorithms.
However, it's (AFAIK) still part of Stack Exchange's mission to "make the Internet a better place", and promoting incorrect answers (as judged by community voting) to the top of Google's search results does not serve this purpose.
Fortunately, while we wait for Google to improve their snippet selection algorithms to take SE vote scores better into account, there's a simple technical measure that SE could use to prevent these kinds of egregious mishaps: the data-nosnippet HTML attribute can be used to instruct Google (and other conforming search engines) not to include text from certain parts of a page in snippets featured on result pages.**
In particular, Stack Exchange already shows answers with a score of -3 or lower as grayed out, clearly indicating (to human readers with normal eyesight) that those answers have been judged by the community to be of low quality and possibly incorrect. This is technically implemented by adding an extra class ("downvoted-answer") to the element surrounding the answer when generating the page HTML:
<div id="answer-86789" class="answer js-answer downvoted-answer" data-answerid="86789" data-parentid="62217" data-score="-18" data-position-on-page="5" data-highest-scored="0" data-question-has-accepted-highest-score="1" itemprop="suggestedAnswer" itemscope itemtype="https://schema.org/Answer">
As these HTML elements are also already given a number of custom data attributes, adding one more attribute based on the same logic should hopefully be fairly easy to implement. Thus, my request is:
Please add the data-nosnippet HTML attribute to any grayed-out answers with score -3 or less.
*) While clearly not enjoying community consensus, the answer is also clearly a genuine and well written attempt at answering the question, and the question itself is somewhat subjective, with a small minority of voters (+3 vs. -20) actually agreeing with the answer. Thus, while (arguably) wrong, the answer does not appear to be "extremely low quality [with] little to no scope for improvement" and thus, per the help center and the FAQ, it may deserve to be downvoted but not deleted.
**) AIUI, Google may ignore the data-nosnippet attribute when generating a Q&A carousel based on structured data. But those already take vote counts and acceptance status into account as long as these are marked up correctly, which SE already seems to be doing.