Why is it wrong for a new guy at work to bend and break the rules but it's ok for older employees to do so?

So within all of my jobs I noticed that when you start a new job the veteran employees there will snitch and tell you for breaking the rules and not doing stuff right and management would correct the new person but when the new person notices the veteran employees breaking and bending the rules and complains about it, management and HR ignores it, why is work like this?

Why is it wrong for a new guy at work to bend and break the rules but it's ok for older employees to do so?
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