To a point. Bush Jr. was magnanimous and he got his butt kicked for it. VANQUISH them first, ie. clear them out of all positions of power. THEN maybe offer the olive branch.
Yes, that’s how winners do it.
Naturally, in order to be magnanimous in victory requires VICTORY. That means, in this context, one man standing and no more (like Highlander, “there can be only one!”).
But then Trump and his supporters MUST offer the olive branch...or we will all lose in November and thereafter.