Exactly. Friends of ours from CO moved to Puerto Vallarta maybe 2 years ago with 2 daughters around 5 and 8(wife knows all the birthdays and such, I just pay Amazon for their gifts)! Said the rainy season is tough on them mentally. Stuck inside quite a bit I guess. Still say it was a good move for them and their girls are both speaking Spanish very well! They kept their house in CO and come back a couple of times a year. Plan is to stay one more year so the girls have 3 years of Spanish.I would consider very carefully the level of medical care outside the US. For all the flaws of our system it still is the best in the world and obviously as we get older, we rely on that system.
Next, I would definitely consider taking a very extended vacation to wherever you you are considering. No less than six months. Let that honeymoon period wear off and see if things really are greener on the other side of the fence before you commit.
It's not guns or violence or lack of healthcare as reasons - just homesick. Miss the mountains, fresh air, hiking and of course friends/family. We'll never pack up and move but a month here then a month there are definitely in our retirement plans.