Are bent oscilloscope probe BNC connecter pins usual feature?
Not usual and not part of the connector standard I'd say. But acceptable if it does not actually foul. 

Straightening the pin (which should not be necessary in new equipment) would be likely to be safe for a careful competent user doing things with due care. One method is to slide a tube whose ID is just larger than the pin's OD, over the pin and bend slowly and gently.

Semi-universal special tool [tm]:
In emergency situations (eg bent pin on CF card reader &amp; far from home) a remarkably successful tool is a ballpoint pen with the tip retracted. The hole is much larger than the pin diameter but the pen tip fills much of the hole and the pin slides in between tip and barrel. Bend carefully. I have used a ball point pen for this purposes a number of times over the years to straighten pins when nothing else is available. Success rate is much larger than one may expect. Probably not suitable for BNC. May be :-).