If anything, Hertl did SJ a massive favor by asking for a trade. I certainly doubt he "demanded" one. That's not in his character, at least from what we've seen from him for the last decade. Anyone, ANYONE who has an issue with Tommy wanting an opportunity knowing Grier had probably made it very clear that the rebuild was going to take a while is just someone who just can't handle sports emotions very well.
I think it is not only possible, but desirable, to believe many things at once:
1) it was great for the Sharks that Hertl agreed to a trade, or even if he asked for one. He's gone now, and the Sharks are #1 priority, and Hertl's future success has no bearing on us, in fact, his failure at a team level is good for us in 2025
2) it doesn't say anything about his character that he asked for or agreed to the trade. He could have had a change of heart, he could have been ignorant of the situation when he signed, but none of it makes him stupid or an asshole or anything else
3) One can love the guy and be sad he's gone and especially sad he went to Vegas, and still believe #1 (that Vegas's continued pain is better for us and therefore hope that Tommy doesn't lead them to success).
I certainly have respect for him, loved his time here, and don't feel the need to harbor any ill will. I just want them to finish bottom 10 next year is all. And ideally continue that failure while they still have no 1st rounders, just so they can feel extra pain as a franchise. #sorrynotsorry