Again, I was talking in general. But if you want to make it specific to this case:
https://www.sun-sentinel.com/local/palm-beach/fl-ne-cb-day-spa-crackdown-whats-next-20190326-story.html
Again, what I find discouraging is when the prosecution isn't able to convince a witness to testify (when she has lots of reasons not to testify) that a case isn't brought and everyone gets to

and act like it's all good.
In this case in particular, I seem to remember their initial "evidence" of ongoing trafficking was that there was food in a refrigerator, dirty dishes in a sink, and it appeared that someone might have slept on the premises because there were blankets on site. IIRC, the authorities came out after the article you linked and later said they did not have evidence or knowledge of trafficking having occurred at this particular location. IMO, once they determined that and before they went public, they should have abandoned pursuit of the case, packed up shop, called it a day, and moved on to bigger priorities and not charged anyone with anything. The D.A. should have known at that point that the case would eventually crumble for all the reasons it is getting dinged for.
As for your running theme that not enough people care about human and sex trafficking (or appear indifferent) and both of those are evil, I think plenty of people would agree with that as a concept. However, I am not sure that this is the cornerstone case to use to trumpet that cause. We all have heard of horrible sex trafficking cases where young women and underage girls are kidnapped, taken to foreign countries, and basically shackled in a basement and used and abused as blow up dolls for years without even seeing the outdoors or sunlight.
I don't know all the details of the Kraft case (and I would guess that most of us don't really have strong knowledge of everything and everyone involved), but I don't see the place in Florida on par with what I just described above. Not to make a callous comment or make light of the situation, but I have a fridge and at times have slept at my office, too, and would attest that there is nothing illicit going on. I believe Kraft is said to have interacted with the 58-year-old woman who owned the spa. Not sure that is in the same category as a 12 or 13 year old girl that was kidnapped or lied to and transported to a different country.
As far as Kraft goes, nothing has surfaced that he knowingly and willingly engaged in activities that had anything to do with human trafficking. However, there are still plenty of people out there that haven't paid much attention and still think he is fighting human trafficking charges (just read the comments on any article about the case).
People asking to connect the dots and suggesting maybe there was more going on seems like is a fair position to have . . . but that doesn't mean the dots automatically can be connected. However, if things were so horrible, one would think the women at the spa would have commented about how terrible things were and thank goodness they were saved and they got their lives back. But they haven't.
What we also don't know is if the cases against all the men are thrown out if the cases against the women will get thrown out, too. And who's to say Kraft isn't paying for the women's defense team as well and they have been told to keep quiet and everything will work itself out. There are a lot of wrinkles and permutations that could be going on in the background that we have no idea about.
Personally, I would have been all in favor if law enforcement had figured out there wasn't much going on at this location and then chose to pursue another one that had more evidence of trafficking (or if they supported the ongoing investigations at other sites).