He may be getting old, but his views are long standing and public. His views are now in the national media, and he’s in demand as a speaker at the highest levels of the Holocaust denial community.
The ADL should spend more time condemning miscreants like Hutton rather than doing movie review.
They should do so on the basis of his own merits (in the converse, as the case may be), rather than get mileage out of "this is Mel Gibson's father".
To do otherwise is to merely use Hutton as a vehicle for slamming his son. If they've got something to say about his son, then they should say so directly, using whatever proofs they have, rather than try to use his father as a weapon against him.
"Like father, like son" only goes so far. Otherwise, we'd all be in a world of hurt. I doubt any of us would have to go back too many generations to find a scoundrel or two.
But then, like cops whose work load falls when citizens are allowed to carry, they would be in danger of being out of work.