If you are playing someone you have no chance of legitimately beating or even drawing (say, if I were playing Anand), it is the best move. Why? Your opponent might accidentally brush the king with his hand, ...
The touch move rule only applies to deliberate touches of the pieces, not accidental touches.
What is "deliberate" can be subject of opinion.
The person I responded to explicitly stated "accidental". So there was no question in that case that the touch was not deliberate .
I know, and wasn't commenting that. I just wanted to point out that "deliberate" can be matter of opinion.
Person who lets say accidentally touch his piece, will probably say it was accidental.
His opponent on other hand might say it was deliberate, so it would be difference in opinions, which would then call for an arbiter to decide.
Looking at some threads I have found here it seems that there has been tournament games with: 1. e4 e5 2. Qh5 Ke7 3.Qxe5#. (Edit. davepacker, thank you for pointing the error, Qxh5 replaced with Qxe5).
You probably agree that Ke7 wasn't intended move and chances are that poor guy accidentally touched his king, but obviously touch move was enforced, so it means that his opponent won the argument
Please note that I didn't comment a moral side of such enforcing, I just wanted to say it can happen
2...Bd6!?
Nah. 2...Bd6 gives up too much. The bishop has great scope where it is. 2...Nf6! :)