Sometimes the needs of the moment require a strike rather than a parry or an evasion. Aikido is a method of fighting, and before getting too spiritual about it all, (the meditation and 'spirituality' aspect of the martial arts that many people groove to), please remember that the purpose of martial arts is to end fights by

1) not engaging in the fight
2) avoiding the fight
3) escaping from the fight         or
4) laying a real shit kicking on the attacker(s)

If you continue to parry or avoid without leaving, eventually you will be hurt. There is a point after which patience and tolerance becomes indulgence and stupidity. That point is different for all people.

I don't know a heckuva lot about akaido--other than it is a neat fighting style (see the movies of Steven Seagal). But I do know something of wing chun, and the principles are 'similar'. Basically, if you don't want a fight, attack the behaviour or the post, not the person. But don't ever expect to attack the person with impunity. Not too many people have the will or desire to be attacked personally on the internet or in life. IMO.