He said:

I think that you are discussing false faces and nongenuine smiles, and valuing laughter. But it reads like someone with a lot of resentment deciding to talk about smiling.

I discussed why I am not ultimately sold on this view in my comment above, but I will say that it involves me giving you the benefit of the doubt. However, like you said:

Smiling (the Heart), and the expression of laughter, uses emotion to melt the ice and forge bonds of friendship in spite of the Mind's intellectual objection. It forces us to re-engage despite pains of the past.

which echos the gist of what I got out of it. Much of this hinges on me holding on until the end to make an assessment, but even then, there is still some ammunition for @corpsvalues interpretation.

My two biggest hangups:

To man beguile, first make him smile

The rest of the stanza put this in context and tells me that you are talking about other people on line 1, and the reader on lines 2-4. But even with the context it is not a far leap to see all four lines directed at the reader. Then it becomes a choice between using the power of the smile for good, or to perpetuate the evil from the first half of the poem. If you accept this alternate interpretation, then you open the door to the fact that the author acknowledges and is even implicitly OK with either option that the reader chooses, as long as they are aware of the gravity of their actions and the consequences. This is rather dark, and it's not what I got out of it, but re-reading I can see how you could take this away from it.

The second hangup:

Friendship, your face like a fool

Fool has a negative connotation to it, although I rather quickly gathered that you were referring to the mirth of a court jester kind of fool. However, it would not be a far leap to think you were belittling the concept of friendship and doubling down on the warning from the first half. Especially if you consider the alternate interpretation in my previous paragraph, then this almost reads like a balancing of the scales in favor of using smiles selfishly and presenting the reader with the choice once again: do I risk becoming the fool with honest smiles, or should I instead allow the mind to usurp the power of the smile and use it to manipulate others?

Again, this is not where I came from on my own initial read (or even subsequent reads), but just me intentionally looking at it from the opposite angle.