Short Term Missions Trips: are they helpful or hurtful?

I had a chat with Moishe Rosen, founder of Jews for Jesus online one time and he was adamant about how short term trips are not helpful as they often cause far more stress on the hosting missionaries than the help given by the short term missionaries (Its hard to call them that when it's so short--more like visitors). I believe that in our culture, most who go on short term missions really just want a paid vacation. I figure that if someone is wanting to see if they want to go in that direction of ministry, they'd already being evangelizing locally. In just about every case I know of (and' tis the season for the income barrage of money requests for these trips), none of them are already evangelizing. Most never go on either, to be missionaries. We wouldn't dabble with people stepping into the pulpit for a few weeks just to see if they are shepherds, would we? Also, the other problem is the presumption that Christians are to pay the way of these folks. It's wrong. These young people (usually they are young) want to go on a trip, let them work for it and stop putting friends, family, and churches in an uncomfortable situation of having to say "no". They should plan ahead like everyone else that desires to go abroad.

Those folks in the video have no clue about the Great Commission, nor how to make disciples of Jesus which tells me they are just as lost and are merely into social justice--something even Hollywood does. They make my point---they think if people like us ("kill them with kindness") they'll like Jesus. This is a FATAL FLAW. It's man-centered and is NOT evangelism. And these people want others to pay their way to go build a house or serve a meal or "just love on them"? I'm sorry, but Jesus DID walk into people's lives (where they were "at", btw--that false accusation of preaching to people being cold and heartless is tiresome) and told them of their sin and need of repentance or face Hell.