I mentioned the pagan roots of Christmas in relation to the traditions still serving their original purpose despite the over commercialisation of the period.

Valentine's Day has lost all resemblance to it's initial purpose on top of the over commercialisation.

If people want to celebrate the birth of Christ around the winter solstice, why not?

Nobody knows when he was born and if you are Christian picking a time when everyone else is celebrating makes a lot of sense and the festivities still serve the same function if you are a pagan or a Christian.

Easter has points of similarity with some Pagan festivals too but it's also around the time of Passover and so fits in with the gospel narrative.