The Red Bull driver was given a drive-through penalty as the move contravened guidelines introduced this season.
Alonso said: "It was dangerous for the nature of the circuit. It's 300km/h and we were jumping on gravel. Not nice."
Asked if the penalty was fair, Vettel said: "From my point of view, no, but it's not for me to judge."
Governing body the FIA issued a clarification on driving standards following controversial incidents at the Bahrain Grand Prix in which Alonso and McLaren's Lewis Hamilton both felt Mercedes driver
Nico Rosberg had been over-aggressive
in defence of his position.
“It was dangerous for the nature of the circuit. It's 300km/h and we were jumping on gravel”
The rule says: "Any driver defending his position on a straight and before any braking area may use the full width of the track during his first move provided no significant portion of the car attempting to pass is alongside his.
"Whilst defending in this way the driver may not leave the track without justifiable reason.
"For the avoidance of doubt, if any part of the front wing of the car attempting to pass is alongside the rear wheel of the car in front this will be deemed to be a 'significant portion'."
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