The pain one bears in seeing the futility of life is not so much the burden of genius as it may be the warning sign that one has missed something important.
I do not understand what you are trying to convey with this sentence.
If one is unable to consider the possibility that there might be meaning and purpose, is he not as dogmatic as the most obstinate religionist?
Are you talking about objective higher meaning/purpose, or self-created subjective meaning/purpose?
No one disputes the existence of the latter. Provided that the former exists, it is practically worthless, since no one knows what it consists of.
How is one to fulfill an objective purpose if one does not know what that purpose is?
Is the existence of an unknown abstract objective meaning not indistinguishable from the absence of objective meaning?
Now you might counter that it is our task to search this meaning. Well, how does one approach this task?
A physicist can cherish the belief that there is a grand unifying formula that unites all branches of physics. He doesn't know what it looks like or even whether it exists at all, but he can search for it.
What sets this quest apart from the search for an objective meaning is that the physicists have the scientific method at their disposal and they are working in a (mostly) well-defined framework.
These tools are not available to those who search the meaning of life. Attempting to use them would amount to a category error, much like the atheistic argument that God does not exist because his existence cannot be scientifically proven.
Is then not all we are left with blind faith?
Given the choice of blindly believing or not believing at all, why should one choose the former?
Would it not be more rational to believe that there is no objective meaning instead of blindly believing in it?