Totally not unreasonable. I consider it a classic Jurassic park type scenario as the medical professionals involved said he did it because he thought it would be a challenge:
"scientists were so preoccupied with whether or not they could, they didn't stop to think if they should"
The sad truth is now 2 small children will probably be orphans before they are even into double digits and its all because they wanted to see if it was possible to successfully artificially impregnate a 70 year old. great work doc 