Some want the spectacle, the accoutrements and game of a scared spouse looking for his wife, putting up posters, being on the media circuit every day, etc.
IF a spouse has killed their partner, I don't want any of their B.S. or any of their pretend emotions or their parade or any of it. I got a mountain of that with Scott Peterson and many, many other killer spouses. I say, "oh please, spare us the lies."
Here's the one thing that matters if you killed your spouse: your crime is discovered and dealt with. Take yourself to LE, confess what you've done, and lead LE to your partner's remains so they can be recovered, brought home, and given a dignified resolution to something horrible.
THAT'S what matters when you're the reason for someone's disappearance and not being found. Save your beloved children from not knowing and constant worry, save your family members, save your friends, save your jurisdiction from wasting any resources, manpower, equipment. Be brave in the way that really matters if you've done wrong, stand up, own it, and don't play the games. That's what someone with integrity does -- when they do wrong, they admit it.
And if you won't do that, then get ready because LE will not give up, will not believe your b.s., and the truth will be discovered.
IMO