The actual concept of giving thanks is indeed lovely. That’s what most people (in the US I’m referring to here) see it as. From an actual historical perspective though, and at the risk of being a killjoy (which is fitting as that label relates to the group of people in question), it’s far from “lovely”.
Some sources for context:
The Puritan policeman:
www.jstor.org/stable/2085847
When Christmas carols were banned:
www.bbc.com/culture/article/20141219-when-christmas-carols-were-banned
The most extremist, persecuting Protestant cult (Pilgrims, made up of Puritans, who left England as England wasn’t intolerant enough, see the first source), get fed by a group of Natives (who would see their land taken from them by the very colonists they fed). It’s no coincidence that it was colonists (namely thomas jefferson, the fella who owned 600 black slaves (“inferior to the whites in the endowments of body and mind” he wrote), and who dehumanised Natives as “merciless Indian Savages” in the Declaration of Independence) who made commemorating this a holiday. It’s coloniser day, that’s what it is.
Imagine in late 1939 if some Polish people fed some starving Germans who had recently invaded Poland, and then a certain German leader said let’s commemorate this event...ie.giving thanks to the persecuted Poles for feeding the invaders... you would laugh at the absurdity of it all (and downright cheek of the Germans).
Besides all this, as a catholic, I ain’t giving thanks that a cult (who would have had me hanging from a tree) got fed. This sect also murdered Quakers (Boston Martyrs...Mary Dyer the most famous) and only stopped after Charles I banned them from doing so. They also banned Christmas, see the second source (deeming it a “popish invention” and “rags of the beast”) which also makes it silly to commemorate what happened to a group of people one month and then the following month mark an event the same group of people banned. They also banned football on Sunday’s, banned toasting each other’s health, banned theatre (tore down Shakespeares Globe), banned couples dancing ...so any acting (movies), sports or basically enjoying yourself ...none of these should be happening on the day of commemorating what happed to a cult (but they obviously do...I mean they have NFL games on for Pete’s sake...the bleeding irony of it all).
Giving thanks (on its own) is indeed a lovely concept, but to clean up the event it should change its historical aspect by giving thanks that this tyrannical cult didn’t inflict more damage than they did.