I really can't understand the dirty player narrative Dellavedova is currently receiving...
The Korver injury was a freak injury. Dellavedova dives for the loose ball, turns to protect the ball like you are supposed to do when the ball is live, otherwise it's likely a jump ball. Korver was in an unfortunately awkward position that his ankle got trapped.
On the Horford play; Dellavedova seals out the bigger man, Horford has him in an arm bar and pulls him down, over Carroll and off balance into Horford's own body, who proceeds to overreact and retaliate.
The Gibson play is the only one of the three plays in question that i would consider extracurricular. The leg-lock is one of those niggling plays that is aimed at gaining a reaction. Sure it should have been a tech, but it's not like there was any intent of causing injury. In the end it got Taj frustrated and did it's job.