They were talking about the universe having a purpose--and that's a big thing. What would be their answer to the question: Why does not all fruits taste like banana--is there a PURPOSE to that?
As Straggler has pointed out there are examples where there is an apparent negative purpose to many things (if one is to assume a purpose). If there is a purpose how then do you go about explaining the vast number of examples that could be provided where the 'purpose' appears to be decidedly negative? Did the creator make a mistake in creation and not make positive purposes to all things or was there two creators, apparently working together, but with different goals? (one to make apparent 'good' purpose to some things and another to make 'bad' purpose to all others)
It should be obvious to you that when assigning purpose to one example that hundreds of counter examples can be provided that put into question the whole 'omniscient, omnipotent, omnipresent, omnibenevolent God' idea. Did you simply not think of that or did you perhaps think that nobody would notice such a fundamental blunder? Its not to say that I have not seen a few blunders take place on EvC, it just seems that if you can explain such an apparent problem in your argument now would be a good time to get around to it.