For the most part, people can safely do it.
For certain very lucky values of "safely", sure. Taking your eyes completely off the road to do something is, quite simply, never a good idea.
Well, in a technical sense it is less safe than not texting while driving but so many people do it without incident each and every day that they consider it safe enough for them to do it.
A lot of people drive drunk and don't cause accidents (or only harm themselves) yet we don't consider it to be safe.
It is a lot like driving with one hand verses two at the ten and two positions.
No, it is far much more like driving drunk.
Many people can safely drive with one hand but it is safer to be in the ten and two positions with two hands which is why we need to do it to pass most driving tests.
Generally only the case if your car has an automatic transmission. Rather hard to do that if you are taking a test with a standard transmission.