Trump did that as a favor to Netanyahu. And how did Netanyahu return the favor? By being one of the first heads of state to congratulate Biden on his ‘win’. This while many were still questioning the legitimacy of the election. Trust me Trump hasn’t forgotten this betrayal.
You’re overstating it. It’s what heads-of-states do. He knew it was unlikely to be overturned, so he ingraiiated himself to the new regime. Sucking up to SloJoe was in his calculation best for Israel and we don’t know everything that went into that calculation. If it had be overturned there acceptable “means culpas” would have been said and life would have moved on.
Bet he regrets it now.