This is the faith fallacy and a statement of incredible arrogance. If we can not know an answer with certainty the answer must not exist. After all, if the answer existed, the exalted human mind would be able to find out the answer.
We refuse to accept that there is a truth whether we can determine it or not. Our job is to continue to try to find it, even if we know in advance we are doomed to fail. The idea that we may be doomed to fail really upsets the arrogant among us.
There is a truth about whether G-d exists. It is a fact, not a matter of opinion. No human being will be able to find more proof than we have now without dying. But our inability to see Him has no bearing on whether He exists.
In the same way, there is a true point at which cellular material becomes a full fledged human being. We may or may not ever be able to figure out that point. But that doesn't change the reality. The point is a matter of fact, not opinion. Anyone who kills a child after that point has committed murder.
For myself and my nation (law), as long as there is doubt, I would rather err on the side of too soon rather than too late.
Shalom.
Exactly.
Of course, if a particular person decides to not pursue finding the truth, that person is free to decide to stop looking.
But they shouldn't use the feeble excuse that, just because they did not bother, or could not determine the truth, that means that there is no truth.
For example, imagine my car's temperature gauge is stuck and reads "Normal" all the time. If I see steam coming out from under the hood I'd better stop and check under the hood. Just because I would find it more "convenient" to accept the reading on the gauge, doesn't mean it's true that the engine isn't overheating. It's either overheating or it isn't. I should take steps to determine the truth. If I decide NOT to take those steps, and decide to ignore the steam, I still haven't altered the truth of the situation.