First of all, to say yes is ONLY an assumption, it is not scientific. It can in no way be proven.
Well, it certainly can be "proven", at least as "proven" as anything else can be in science. Namely, one can figure out what we should observe in the real world if the decay rates were not constant and then see whether we actually do observe those effects. If after constant investigation we never see these effects, and we cannot think of why we shouldn't see these effects, then we can say that the constancy of decay rates have been "proven", or, in more correct scientific lingo, the constancy of decay rates have been established to a high level of certainty.
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Secondly, it is completely in line with the scientific spirit to question and test to find out if there is any evidence to suggest that they havent been constant.
Exactly, just like I said above. And you know what? Creationists never do this. I have never seen a creationist source make a prediction of as yet unobserved phenomena that would exist if her theory of non-constancy of decay rates were correct. That's because creationists don't do science -- they make up
ad hoc excuses whenever reality contradicts their beliefs.
But this question has been investigated -- by actual physical scientists. Like the idea of a non-constant speed of light, people have looked for definite signs that decay rates may not have been constant. They have never found such signs.
So you are correct. Good scientists have questioned basic assumptions, and tested whether the basic assumptions are valid or invalid. Sometimes basic assumptions have been overturned. But in this case, it appears that the speed of light and the decay rates of radioactive elements have been constant over the life-time of the earth. If they have varied, they haven't varied enough to leave definite signs, and so not enough to give the creationists an out.
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Third, to supress, reject, and criticize such research is against true scientific spirit.
It is well within the spirit of "true science" to criticize research -- that is the point of peer review, to allow other people to examine your methodology, your data, and your conclusions. It is well within the spirit of "true science" to point out serious errors in a scientific project that casts doubt on the validity of its conclusions.
Disregarding sloppy methods, inaccurate data, and fallaceous conclusions are not "suppression".
Edited by Chiroptera, : typo
Computers have cut-and-paste functions. So does right-wing historical memory. --
Rick Perlstein