In Euclidean geometry, when something is rationally proven as true, you have universal acceptance of the results, such as that the base angles of an isoceles triangle are equal.
Maybe, but acceptance of controversial truths doesn’t necessarily mirror acceptance of Euclidean geometry. Some proven scientific discoveries have been widely disbelieved long after they’ve been proven. Perhaps you can come up with examples.
However, here you say that it is rational to punish the manufacturer of the birth control pill and prohibit their distribution.
Sure, because the manufacturers would then be violating the law. If a law was passed banning birth control, in order to be rational it would have to permit manufacturers to comply. It wouldn’t be rational to go in and punish someone for doing evil if you don’t give them an opportunity to do right. First pass the law banning contraception; then let the manufacturers and distributors pull their products. If they violate the law, then you can punish them.
But I doubt that you are going to get more than 5% of the population to agree with what you consider to be rational in this case. IOW, it is questionable that what you claim to be rational, really is rational.
That conclusion does not follow from your premises, and one reason why is because you can’t jump from “most people disagree” to “therefore you aren’t being rational.” Also, I think the 5% guesstimate is also only true for Western society at the present time. Before 1939, I think, birth control
was illegal, and therefore I think the percentages must have been different quite recently. In some countries, I think far more than 5% would be happy to ban contraception.
People still weep when a loved one dies.
That doesn’t make death a strictly implied part of life. Rather, it suggests the opposite.
The evolution of altruism and morality is an ongoing study.
True, and because it is being studied, there are some things we can say about it right now. For example, the following statements must be true:
Either evolution gives us obligations or something else does, or both, or neither. People either have obligations or they do not. Because of the law of contradiction, we can know that some option must be true in each of the previous two sentences. But all options reduce to absurdity except the one that says something other than evolution gives us obligations.
If evolution alone gives us obligations, and if we have obligations, then it logically follows that we are obliged to obey evolution at least in some matters. That reduces to absurdity for several reasons. Among them, if evolution is not a person, it does not need to be obeyed.
Therefore, something other than evolution, something personal, must give us obligations, or else we are not under any obligation to be moral, or to be anything else.