How can we take death and the villains in Marvel seriously when they kill off the heroes that have announced upcoming sequels?

Marvel is specifically telling you that those deaths won’t stick. That’s the point. It’s literally the point.

Marvel is completely aware that you are going to have to wait a year to see the second part of the movie. Marvel hopes you have an emotional attachment to the characters. Marvel knows that many children will be seeing the movie. black canary costumes

So Marvel spelled it out in giant glowing letters that these deaths will be reversed. Marvel wants you leaving the theater excited to see how the cliffhanger will be resolved (even if it is a somber excitement), not anxious about the death of one of your favorite characters. So they explicitly killed Black Panther, Spider-Man and the Guardians of the Galaxy, because those are characters that already have sequels being worked on. thea queen cosplay

Or

Spider-Man?

As you can see from these images neither is T'Challa or Peter Parker. Shuri, and Miles Morales both took up the mantle. So if Marvel decided to, these could be the stars of the sequels. injustice 2 joker costumes