When I learned that kids in my city couldn't swim, I started to rethink how much I'd invested in overseas missions
Something to consider and act on.
Perhaps some of these trips can also be detrimental to other forms of ministry. Could it be that some short-term missions trips siphon money away from career-missionary efforts?
I'm concerned that for believers who are well off, mission trips can become a form of "spiritual tourism", where people believe that their ability to travel to other places and see mission work (and even participate for a short time) can take the place of their own actual participation in God's work in a local level. If a church or individual has the resources to go on a mission trip, praise God. But I would suggest that there are many more cost-effective and locally valuable ways to get a heart for service and see God's work advanced.