Note: I'm asking about spoiler markup on *answers*, not questions.

I would like to start a discussion on this due to the recent number of spoiler answers on plot-related questions that ask for spoiler info in [tag:bioshock-infinite].   

Since it is not sure what the policy on this is (some answers in those questions have spoiler markup, others don't), it would be nice to have policy  that can be applied to all spoiler answers.

Some examples:    

 - https://gaming.stackexchange.com/questions/110615/understanding-the-ending-of-bioshock-infinite/  
 - https://gaming.stackexchange.com/questions/110625/how-did-elizabeth-lose-her-small-finger  
 - https://gaming.stackexchange.com/questions/110650/elizabeths-brooch-does-the-one-i-pick-matter  
 - https://gaming.stackexchange.com/questions/110652/does-throwing-the-ball-at-the-helpless-captives-yield-a-different-result  
 - https://gaming.stackexchange.com/questions/111795/what-was-up-with-coin-flip-question-in-bioshock-infinite
 - https://gaming.stackexchange.com/questions/112065/who-is-the-dead-man-in-the-lighthouse
 - https://gaming.stackexchange.com/questions/111831/who-or-what-was-songbird  
 - https://gaming.stackexchange.com/questions/112313/what-did-the-woman-in-the-boat-mean-when-she-say-he-doesnt-row  
 - https://gaming.stackexchange.com/questions/111981/why-is-booker-puzzled 
 - https://gaming.stackexchange.com/questions/111811/what-is-the-difference-if-i-spare-or-kill-capt-slate  
 - https://gaming.stackexchange.com/questions/113275/who-was-lady-comstock  
 - https://gaming.stackexchange.com/questions/112529/where-does-elizabeth-get-her-powers-from
  

>Note: **SPOILERS AHEAD.** Answers may contain spoilers. BioShock Infinite spoilers.