Hi 
First I tell you that while the shelves of history approve your argument, there is a final detail that you ignored.
Days before the beheading of St. Valentine, he was imprisoned in the Roman dungeons. There, between going and coming, he met the daughter of Carlos II (the emperor). The girl was blind from birth and according to historians, Valentine's kindness was so great that from that moment began to pray for her to recover her sight.
There were no major changes until minutes before the beheading. Valentine handed the girl a piece of paper that said "your Valentine". As you suspect, it doesn't make sense because the girl was blind.
Well, at the end when she sees the paper she recovers her sight and without understanding what said there, she looked up as Valentine died. Since then the martyr figure of Valentine became more famous, in addition to that scholars in the matter say that he was in love with her since he met her.
We must not forget that Christianity has covered many of these stories, but we cannot deny the romantic charge it has.
To conclude, it seems appropriate to lend a hand to literature, and share with you the first poem PUBLISHED where the holiday descends to St. Valentine appears.
This poem is by Geoffrey Chaucer and is titled The Parliament of Fowls (1832). It should be noted that since the publication of this poem, the celebration of St. Valentine has taken center stage in Western culture.
Nature, deputy of the almighty Lord,
Who hot, cold, heavy, light, moist and dry
Has knit in balanced measure in accord,
In gentle voice began to speak and sigh,
"Fowl, heed my judgement now, pray I,
And for your ease, in furthering of your need,
As fast as I can speak, I will you speed.
You know that on Saint Valentine’s day,
By my statute and through my governance,
You come to choose – and then fly your way –
Your mates, as I your desires enhance.
But nonetheless my rightful ordinance
I may not alter, for all the world to win,
That he that is most worthy must begin.
The male eagle, as you all must feel,
The royal fowl, above you in degree,
The wise and worthy, secret, true as steel,
Whom I have formed, as you can see,
In every part as it best pleases me,
It needs not that his form I must portray,
He shall choose first, and speak in his own way.
And after him in order shall you choose
According to your kind, as you devise,
And, as your luck is, shall you win or lose;
But that one of you on whom love most lies,
God send him she that sorest for him sighs".
You can read it full here, it's a wonder!
Thanks 
PS: I would add a touch of lemon zest to the Creamy Vanilla Icing/Frosting, for a better scent ; D
RE: ADSactly Food - 💜Red Velvet Cupcakes for Valentine's Day 💜