Caulking the Cracks

The tiny cracks in the siding should be sealed.  We don't want bugs or dampness to get in. 

And yet, in my recent wasp debacle, one of the prime rules I discovered is to NEVER seal a hole or crack in the house where bugs come and go.  After all, you may seal them in, and then you'll have a worse mess.

But ...

But if you don't seal the crack, then the insects will keep sneaking in. 


So the point is that cracks ought never to develop -- because there is no right way to deal with it?  Who comes up with this advice?