Re: Is it wrong if my purpose in aikido is to be strong?
In my opinion: not at all. Make your mind and body strong.
But beware though that it is possible for this to become a quest for power...and that can be something entirely different.
I think it is helpful too to recognize that as some have said about Aikido....50% of Aikido is body practice (/aiki) physical side of things and the other 50% was Ueshiba's spirituality. You should consciously decide who and what you want and are. Otherwise the decision will be made for you implicitly. Decide consciously for yourself. If there was no line drawn there would be no line to cross.