The Texans want three first picks and MORE. It's hilarious what a clown show that franchise currently is.
Make no mistake, the Texans are indeed a hilarious clown show, but making that demand for Watson is pretty much completely reasonable. It's a tough situation to be in, one that on the scale of cosmic (or is it karmic?) justice they deserve to suffer, but the way out of it certainly does not involve shipping away Watson for anything less than a king's ransom.
We can probably classify the range of outcomes into three groupings. The first is one where nothing comes of the allegations; they fail to successfully make their case in civil (or criminal) court, and/or there is insufficient evidence to either force or convince the league office to hit him with a heavy punishment. The second is where the legal cases bear fruit; Watson faces civil penalties, his image is totally nuked, and the NFL hits him with an Adrian Peterson-like punishment, or some such outcome.
In neither of these two outcomes does it make sense to trade him for anything, or at least much, less than what the non-rapist version of him would get. The Texans would be hurting their own chances by doing so, and even looking at it from a moral standpoint, they wouldn't actually be making any sort of strong stand by giving him what he wanted anyway and trading him to another team; they'd only be allowing an unscrupulous team to benefit from their willingness to take on a likely sexual predator. However, there might be something tempting about letting another team take all the heat for employing Watson, but I don't think most NFL FOs would place the cost of that heat as being greater than multiple FRPs. Cap relief could be a consideration, though.
It's like, if Caserio trades Watson right now for substantially below his 'typical' value, in which of these two outcomes does it actually end up being the right move to do so? If he's going to end up playing no matter what, why subsidize another team's willingness to put up with everything about him?
There is the third possible outcome, albeit one that seems pretty unlikely, is that criminal charges come down, the NFL league office hits Watson with a massive ban, or something of that sort happens that results in Watson having played his last down in the NFL. In this case, it makes plenty of sense to steal some value from another team... but this is an absolute fringe outcome, or at least so it would seem to be. It might not be, but it would be kinda dumb to not wait for more information to become available with regard to the legal proceedings and start making assumptions.
The market dynamics are really such that a Watson trade is incredibly unlikely. The acceptable cost for an acquiring team to pay is not equal to the acceptable price for the Texans to charge.