Pietersen scored just 19 off 59 balls before attempting to slog Australian paceman Peter Siddle over mid-on where he picked out a leaping Mitchell Johnson.
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It was the 10th time that Siddle has dismissed Pietersen in Test cricket and third in a row this series.
Carberry scoffed at suggestions that the South African-born Pietersen, who passed 8000 Test runs during his 95-minute innings and is England's fifth highest runscorer, should have adopted a more conservative approach with his batting.
Pietersen's wicket came just moments after England lost captain Alastair Cook for 72 and left the tourists precariously placed at 4-180 after day two.
"I think hanging on in there is a dangerous terminology sometimes when you bat because you're out there to score runs," Carberry said.
"As we know, Kevin's a positive player and that's what made him successful over a long career.
"He does things that not many of us can and it's a shot many of us have seen him play time and time again and hit it out of the ground.
"It's obviously disappointing for him and us, but we want people to play how they play naturally and I wouldn't want to see Kevin put that shot in the locker."
Cook and Pietersen both departed to rash shots after succumbing to the intense pressure from Australia's bowlers in the sweltering Perth heat.
It has been a regular theme for England's batsman this series and something the tourists will need to overcome quickly if they are to prevent Australia from regaining the urn.
"I think if we're honest with ourselves, the pressure has brought about some bad decisions and bad shot selection," Carberry said.
"Having said that, in this innings we've picked and choosed when we've gone hard at certain deliveries, which I think is the way to go.
"We've recognised that this surface is slightly different to most other surfaces we're going to play on and you have to know the areas you're going to score in and, similarly, it's also about being decisive in what you don't play at."
Carberry said the England camp was disappointed with Joe Root's dismissal, but had to accept it following another DRS controversy.
Root's dismissal was upheld because the third umpire could not find enough evidence to overturn the original caught behind decision from Marais Erasmus.
"It was obviously a disappointing dismissal for us and a key dismissal for us," Carberry said.
"We were of the opinion he didn't hit it, hence why he reviewed it, but the decision made by the third umpire, obviously we don't control that so it's one of the things we have to swallow I'm afraid."