I personally feel extremely uncomfortable when religion or ideology is mixed into any service that is provided. I completely understand the value that these people are providing, and I completely appreciate that they truly feel that they are doing "good", but I still do not like that it comes with any sort of strings at all (even if they are only passively bringing their religion to the people by waiting to be asked). If the same people went with a group that was not affiliated with a church and went to provide assistance to the local community, I wouldn't have an issue. They can have their own personal beliefs, but when they are in any way related to the service they provide, I do not like it.
With the Duggars, I feel this to the nth degree. It is extremely tacky how they arrive at some foreign place, continually point out how different it is from their home, push their religion onto the local people, and provide less-than-stellar services in return. It really turns my stomach and I feel that they are taking advantage of a vulnerable population.