Here's some Laws that require you form a judgement about a player's intention
Law 17: Maul
17.2 Joining a maul
A player must not intentionally collapse a maul. This is dangerous play.
Law 12: Knock-on or Throw forward
12.1 The outcome of a knock-on or throw forward
Unintentional knock-on or throw forward.
Variations: Under 19: Law 20: Scrum
20.9 Scrum - general restrictions
A player must not intentionally keep the ball in the scrum once the player’s team has heeled the ball and controls it at the base of the scrum.
Variations: Under 19: Law 20: Scrum
20.11 Scrum wheeled
A team must not intentionally wheel a scrum.
Variations: Seven-a-side: Law 20: Scrum
20.8 Front-row players
A front-row player must not intentionally kick the ball out of the tunnel or out of the scrum in the direction of the opponent’s goal line.
Law 16: Ruck
16.3 Rucking
A player must not intentionally fall or kneel in a ruck. This is dangerous play.
Law 10: Foul Play
10.1 Obstruction
A player must not intentionally move or stand in front of a team-mate carrying the ball thereby preventing opponents from tackling the current ball carrier or the opportunity to tackle potential ball carriers when they gain possession.
Law 10: Foul Play
10.4 Dangerous play and misconduct
Front row players must not intentionally lift opponents off their feet or force them upwards out of the scrum.
Law 11: Offside and Onside in General Play
11.1 Offside in general play
A player who receives an unintentional throw forward is not offside.
Law 11: Offside and Onside in General Play
11.6 Accidental offside
When a player hands the ball to a team-mate in front of the first player, the receiver is offside. Unless the receiver is considered to be intentionally offside (in which case a penalty kick is awarded), the receiver is accidentally offside and a scrum is formed with the opposing team throwing in the ball.
Law 14: Ball on the Ground - No Tackle
14.2 Players on their feet
A player must not intentionally fall on or over a player with the ball who is lying on the ground.
Law 19: Touch and Lineout
19.7 Incorrect throw-in
A player must not intentionally or repeatedly throw the ball in not straight.
Law 19: Touch and Lineout
19.14 Offside when taking part in the lineout
The referee must penalise any player who, intentionally or not, moves into an offside position without trying to win possession or tackle an opponent.
Law 20: Scrum
20.1 Forming a scrum
A team must not intentionally delay forming a scrum.
Law 21: Penalty and Free Kicks
21.7 What the opposing team must do at a penalty kick
The opposing team must not do anything to delay the penalty kick or obstruct the kicker. They must not intentionally take, throw or kick the ball out of reach of the kicker or the kicker’s team mates.
Law 21: Penalty and Free Kicks
21.8 What options the opposing team have at a free kick
The opposing team must not do anything to delay the free kick or obstruct the kicker. They must not intentionally take, throw or kick the ball out of reach of the kicker or the kicker’s team mates.
Law 22: In-Goal
22.17 Misconduct or unfair play in in-goal
When a player charges or intentionally obstructs an opponent in the in-goal who has just kicked the ball, the opponent’s team may choose to take the penalty kick either in the field of play, 5 metres from the goal line opposite the place of infringement, or where the ball landed.
Law 10: Foul Play
10.2 Unfair play
Intentionally Offending.
Law 11: Offside and Onside in General Play
11.3 Being put onside by opponents
Intentionally touches ball.
Of course, for high tackles it's different
Law Application Guidelines
Dangerous tackles (high tackles)
Referees and Citing Commissioners should not make their decisions based on what they consider was the intention of the offending player. Their decision should be based on an objective assessment (as per Law 10.4(e)) of the overall circumstances of the tackle.