Is reason reasonable?

I am always struck by the central plank that reason is given to underpin arguments. The question I would submit is 'are we not duped by 'Reason'?

For some regard 'reason' as a weapon, 'why you don't be reasonable?' subtext= why don't you come round to my way of thinking about this argument?

A form of beating you over the head with the weapon of reason.

And is not 'Reason' another one of those Enlightenment apercus ?

There are some who would argue that Reason is always a region carved out of the irrational - not sheltered from the irrational at all, but traversed by it and only defined by a particular kind of relationship among irrational factors.

Underneath all reason, which must have emanated from another 'reason' (I mean reason is not causa sui) lies a kind of drift, or a flawed epistemology.

So I am rather wary of reason in argument and rather place it on a par with the ineffective 'common sense'.

To be utilitarian about it perhaps reason is a poor God but a worthy servant.