Depends on the situation and the size of his mouth.
A straight up respectable player I’ll <S> and wish him best of luck on landing.
His game rank, squad, country, or type plane doesn’t matter.
On the other hand, a big mouth, arrogant braggart flying a kite I’d chase across the map and ram to keep him from landing.
Of course this is just my pet peeve about bigheaded mean people.
But, if the situation is defending or taking a base you’re better off letting him live. As this will keep him out of the fight longer allowing you a chance to beef up your defense or capture your objective.
And of course if he has to fly two sectors with half a wing and kills himself trying to land it, he’ll hate himself to no end.

<S> Bellator