No way....I think a 22lr or a 22 mag is going to make more of a dent in an attacker than some people seem to think.
Even if it doesnt kill them, which they definitely can, it will startle them, and scare the sh*t out of them....Giving you the oppurtunity to get out of there.
In the heat of the moment...a perp will not realized that he has "only" been hit with a 22...
Also I believe i read somwhere that 22mag and 223 have very similar balistics at short range. And I am sure that a 22 hollow point will make a more impressive wound channel that you might imagine.
I beleive that when it comes to personal defense...it doesnt matter what you are packing...as long as it makes a LOT of noise when you pull the trigger, it will be relatively effective in startling your attacker, changing his mind about messing with you, and giving you the chance to escape danger, saving your life.
Now when it comes to home defense...I say, the bigger the better.....But when it comes to concealed carry....you MUST stay concealed...and if that means a tiny pistol, then so be it....it still beats a can of pepper spray.