While I really think that people are different and that if you go into a random MA school, there ARE alot of people that really are there for some of the "side effects" - I tend to agree with you on the core of hte "martial" stuff. This diversity of motivation and presumed "core motivations" I see also in science. Side effects are like, "get well paid job", but the presumes "core" or more like "solving and understanding the mysteries of nature". I know from experience that a minority are in it for the latter core reasons.
So, there must be some other over-riding motivation to do TMA.
...
More than likely it's more primal - the confidence that one can deal with a physical attack
I am naturally pretty strong (for beeing untrained that is), and i never felt i couldnt defend myself, so that is not really the main reason for me. I never felt insecure per see. But I like to be in control, and understnad things in depth (Often in extreme depth by common standards, here I see myself as an outlier). This is an intellectucal challenge for me, and once you gained this understanding of control in some field, it is an internal satisfaction.
So the whole logic, strategy of martial combat, and the neuromuscular control it requires to actually be performed is intriguing and challenging. And to me there is some desire to master this to the extent that is allow by my own limitations. And int particular ot understand how the "optimal system" necessarily is constrained by your actual limitations and strength. Its about skill, execution but also mental strenght and conditioning. To be in complete control and master your own body in a situation of physical attack.
This is what i think is the heart of the matter for me. That has absolutely no affiliation to any style. The reason I enjoy high contact in my style is because i feel that the level of contact you get, will affect the ecological validity of your learnings. The tradeoff is of course that you dont want to actually hurt yourself for life just to enjoy this. This is why non-armed combat, with some rasonable rules is a good level of feedback for me.
For me side effects are I get some physical exercise I would NEVER get otherwise. This is good, but not anywhere near what drives me.
I would refuse to spend say the same time on things like fotball or running! It is totally void of mental challenge and meaning. Needles to ask but can anyeone come up with a good reason why it is meaningful to train how to kick a ball around a grass rectangle trying to score? I'm baffled everday why this stuff is
still on TV almost every day.