Erm - that wasn't anything to do with my post. All I said was that if you go into a tackle half heartedly you will be the one getting hurt - and that is true regardless whether you are big or small. It's not about bravery, if you have a good technique then you don't need to be brave.
One thing that I do get annoyed about is that tackling skills seem not be taught - there is tackling practice, but good technique seems to be expected to be absorbed by soem sort of osmosis, rather than explicit instruction about what is good technique, and why it works. Judo clubs run through the moves in slomo, with demonstrations broken up by stopping and explaining. I rarely see that in Rugby clubs.
EDIP - Explanation, Demonstration, Imitation, Practice - the 4 steps to mastering a physical skill.