When you're in the "right path," nothing you do is wrong, or something to be ashamed about, because you're correct. That's the logic behind it, and why throughout history we have so many people commit atrocities under the name of "peace" and "good."

Yes, your hand will hurt really hard

It can be. It all depends on the section of blade to which the sword is struck, to far to the tip and they can just knock it out of the way, too far to the hilt and your catching the sword not deflecting, too far to center and it's just a block. There is a sweet spot between the tip and center of blade where you can push aside the opponents blade while allowing your's to reach inside of their guard.

Yes, really hard. And in fiction even more so.

you can but its a pain the ass specially on mobile