Some good points there Texastony. And I agree with you that everyone will certainly disagree on the brand of knife or proper caliber or type of sidearm. Such discussions can be fairly toxic as everyone has well justified opinions of the gear they choose to carry..
I prefer a larger caliber because it provides more stopping power and weighs no more that a comparable sidearm in a small caliber.
Granted, the odds of EVER needing to use a sidearm are very, very remote, but one must consider the randomness of the outdoors when planning such an adventure. I tend to prepare for the worst when packing. I always take a poncho, even when the weather is supposed to be clear and sunny...just in case it rains. I generally pack a bit more food and water than I will need... just in case I need it.
My choice in sidearms is along the same line. I agree with you that a .22 will work for most occasions. But what about a rabid animal, or worse, a person on drugs who does not fear the sight or load bang produced by the .22? What if you must rely on that sidearm to STOP the attack?
Personally, I would like to have a 12 gauge at this time... but limited to a sidearm I would like the most powerful caliber I can comfortably carry and shoot effectively. For me, my minimum is a 9mm or .38 spcl with good defensive ammo. If the size and weight of the sidearm are comparable, then why not carry the larger caliber. The only thing you have to lose is your life. Why take the risk?
Again, I understand that the odds of the above scenario are extremely remote... but I try to plan for the unexpected rain shower, need for extra food or water, and yes, the need to defend myself and those whom I love.