Otters don't have to use tools either, but they do because it makes sense, showing they are more intelligent than dolphins.
Yes they have to use tools in order to crack open the shells to get their food. It is like a crab using a shell as a "backpack". Doesn't make it smart.
I doubt you realise the difference between using a stick or rock to crack something open with food in it for thousands of years, compared to building complex structures like boats for no short-term reason.
Nests are very similar to boats, structurally and conceptually. Building a boat to find new resources or avoid overpopulation is equivalent in importance to protecting your young by making them a nest. If your young will die because they have to compete for highly scarce resources amongst an overcrowded population, it makes sense to any rational animal to seek out new resources in different locations.
No they are not! They are not the same at all! We humans have built "houses" for as long as we have existed, but have only begun builting boats that can sail very far the last couple of thousand years, and small river-boats have only existed for a few ten-thousands years.
It doesn't make sense that a T-Rex would think "Hey we are running a little dry on ressources. You, cryphotaus, get me some wood. You, hopalitaus, get me a hammer. I'm going to build a boat so we can sail over the ocean into the unknown."

Why exactly would they use months/years building a boat, when they have no idea what's out there, and they instead could just WALK over the land or kill the other predators in their land.
The dichotomy you are trying to present between brains and brawn is highly misleading. Most successful species, humans included, recruit a combination of both in ensuring their survival. Of course, dinosaurs would have done the same.
No. We humans have almost no muscle-power. We have our brains instead. If we were to have the same muscle-power as an ape together with our brain, we would need way over 5000 calories daily to not lose weight. So we would probably need 6-7000 calories daily to gain weight to survive the cold winter. That is why we don't have large muscles - because we can't have both. That is also why so few animals have large brains. Because they consume alot of calories. I have heard that in a class, where you focus 100%, you can burn several hundreds kcal an hour.
the fact that dogs, dolphins, etc., coexist with humans and yet are completely moronic. The fact of the matter is, as a lethal and effective predator which was perfectly adapted to its environment, the prehistoric alligator would not have faced the kinds of evolutionary selection pressures which forced dinosaurs to develop intelligence in order to overcome the challenges which they faced.
Dogs, dolphins etc don't co-exist with humans. They are wild animals, that have nothing to do with humans. An alligator is a dinosaur, just like most birds are. They haven't changed much.
"develop intelligence in order to overcome the challenges which they faced"
Oh, like what?
But dinosaurs aren't reptiles.
Yes they are.
Dinosaurs would have transported the ancestors of the modern alligator and crocodile with them as livestock and/or pets. Also, both alligators and crocodiles are excellent swimmers, which explains a large amount of their local migration by water.
Why am I even debating with you?

Holding croc's as livestock? Come one.....
Dinosaurs of different kinds had a wide range of biological configurations which would have lent themselves to different technical proficiencies. Actually, you point out the short arms of the dinosaurs which were bipedal. In my opinion, this serves as further evidence of specialisation along the same lines as humanity. Bipedalism frees up the forelimbs for operations such as tool creation and use, and the adjustment of the lungs in bipedal land animals (of which humans are currently the only real example) actually allows for a wider range of noises to be produced, a prerequisite for verbal communication. Bipedal dinosaurs such as compsognathus, velociraptor and deinonychus were ideal candidates for the evolutionary trappings of civilisation.
Their arms was NOT meant for using tools. They were most likely used when running to "move" like we use our arms, or they were simple meathooks, or maybe they were just something that didn't have any purpose at all - after all we have many things in our body with no purpose at all. Like the "tail-bone". The thing is, many dinosaurs broke their arms very often. They simply didn't need them that much.
Their arms had VERY limited range of motion. They could barely be bended