Obviously some sciences are different than others. Physics is physics. Cladistics is far different. Paleontology is a "historical science" and can't be tested the same way you can conduct chemistry tests or analyze mineral content of rocks.
There are brilliant scientists who don't buy into the entire evolutionary theory, hook, line and sinker. Those are the facts, like them or not.
Cladistics is just a different way of approaching classification and relation of species. It is more subjective than hard sciences, however it can make predictions which can be verified through other methods. Evolution of whales is a topic where evolution/cladistics/paleontology/geology combined to make predictions which later turned out to be true. If you aren't aware of the topic here is brief overview.1) Life started in the seas.
2) Life moved on land from the seas.
3) Mammals evolved on land and had legs.
4) Whales are mammals - and don't have legs.
All of these facts are based on classification of fossils based on their structure (cladistics/paleontology) and the age of rock in which they were found (based on numerous different measurement techniques).
The prediction of evolution based on those 4 facts was that somewhere out there (between 3 & 4), there had to be a mammal that went back into the water from land that evolved into a whale. There had to be some transitional fossils of a whale with legs. These smoking gun fossils were found in the 1990s. Prior to this, these transitional fossil were claimed to be impossible to the Creationist crowd including one of the "brilliant" non-believers Duane Gish who spends his life trying to debunk evolution. In fact, Gish said:
There simply are no transitional forms in the fossil record between the marine mammals and there supposed land mammal ancestors … It is quite entertaining, starting with cows, pigs, or buffaloes, to attempt to visualize what the intermediates may have looked like. Starting with a cow, one could even imagine one line of descent which prematurely became extinct, due to what might be called an “udder failure.”
But, do you think that the smoking gun evidence changed his mind? Not at all - he is still believes the same tripe as do all the other Creationists that used the lack of transitional whale fossils as evidence of Evolution being the great hoax.