If a divorce shower is "asking people to support you" than so is a wedding shower and a baby shower. But nobody objects to those.
And I don't understand why one would assume that if a person could use some things to set up a new household, then they must not have tried very hard in a divorce. When my cousin got divorced she had a high school education and had been a stay at home mom (and babysitter for about 8 children) for 6 years and had two children under the age of 6. At this time she and her husband were scraping by. He had been working a low paying job at a Children's Home during the night shift which allowed him to do nothing most of the time he was at work; he was obtaining his MA during the day. Shortly after he got the MA, he left my cousin. She did get some alimony got to stay in the house for a short time before it had to be sold, but he was leaving the marriage with a master's degree and a full-time job and she had only a high school education and 6 years of not working. And since they didn't have much in the way of assets to begin with (they actually owed money on the house) there was nothing but dishes and furniture to split. If a couple didn't have much to begin with, then splitting it up into two households is definitely going to both them in a financial squeeze. Do you people making this accusation only have wealthy friends?
In any case, I think the idea of a divorce shower is fine. Most people I know who get divorced are far from wealthy and definitely could use some help and I don't feel like I'm supporting them anymore than I am supporting people when they get married or have babies. Also I'm sure in a lot of cases a boost to the morale is definitely needed.
As for whether a divorce is "something to celebrate." I figure it isn't the job of the person invited to the wedding shower or baby shower or divorce shower to decide that; if the person going through it thinks it's something to celebrate than so be it. After all, there are plenty of weddings that are the beginning of a disasterous marriage. Plenty of pregnancies that are more regretful than happy.
My only concern about a divorce shower is the money issue--especially since this just funnels more gifts to people who have usually already had other showers before. My divorced cousin is now remarried and has had another baby. So she has had 2 wedding showers, 2 weddings, and 3 baby showers. Though I would have been okay with a divorce shower, that is a lot of showers! Perhaps it would have been good if she had had the divorce shower but not had the shower for wedding #2 or baby #3. I was happened to see the episode of Sex and the City last night where Carrie loses her $450 shoes when a friend makes them take them off at her house. The friend offers to pay for them but balks when she hears how expensive they are telling Carrie "I shouldn't have to pay for your life choices." Carrie goes home and calculates that she's spent over $2000 on her friend's life choices--wedding shower, wedding, baby #1, baby #2, etc--but Carrie has not gotten a gift to celebrate her life choices since graduation, as if her choices are just as valuable or as important as her friends.
That's the way I look at it too. Perhaps there should be a lifetime limit on the number of these events one can have. Everybody gets 3 gift-giving celebrations total. Have them for any reason you want--wedding, baby, new job, new home, became a stripper, won the lottery, got out of prison--whatever.
Seriously though, just because it has become socially mandatory to celebrate other people's weddings and babies, I don't see those things as inherently any more worthy of celebration than any other choice a person makes. In any case, I pretty much figure I'll be in something like Carrie's shoes. My family will never see my choice to get a PhD as worthy of celebration along the lines of a wedding or a baby. And since GF and I are both women, when we do have a wedding or a baby we fully expect that some people in the family will refuse to celebrate those things with us. I figure at least then I won't have to bother sending them gifts for their celebrations anymore!