When is being kind too much?

One of the tenets of Scouting is "a Scout is kind".  We teach the boys that one must be kind to his fellow humans and animals, but when is it going too far?

We have an elderly gentleman in our troop who has been in Scouting longer than my parents have been alive.  He's an institution within our council and you'd be hard pressed to find someone who doesn't know who this guy is.  But the fact of the matter is that he can be a bit of a burden at times.  He lives a block away from the church we meet at and yet needs a ride every time.  It wouldn't be a big deal, but he constantly calls me looking for a ride.  It's not just on meeting days.  He'll start calling me several days beforehand and if he doesn't talk to me, he will call again and again and again.  It's annoying when I'm at work (I've had talks with him many times about not calling me between the hours of 8 and 5 to no avail), but when I'm at home with family, I really don't want to spend five minute yelling into the phone to get this guy to hear me.  This situation is causing some issues between my wife and I as well.  She's annoyed that I have to leave home early in order to get him and that he always calls, looking for me.  Also, I don't want to leave my family for longer than I have to.  Being an ASM and a Den Leader takes a lot of my time and though picking this guy up doesn't take me out of my way, it does take more of my time.

Another problem with this fellow is that he wants me to take him to our monthly roundtable.  If I lived over by him, it wouldn't be a big deal, but I live far East of him and would have to travel past the meeting place to pick him up.  Doing this in rush hour traffic is no small task and again requires me to leave early in order to get him.

I don't want to go against the principle of being kind, but sometimes I wonder when is adhering to one's principles going too far?  I don't want to tell the guy to get lost, but I also feel like I'm getting taken advantage of and no one else is willing to help out.

This whole situation upsets me and I'm not sure what I should do.  I hope the situation will improve, but I don't expect it to.