If you seek to be "good personality", you may think "Budo" or martial arts are violent and not necessary. or even harmful.
Here, I would like to explain why Bushiki-juku practices techniques to beat someone.
First, you can learn human body and improve your physical ability, by doing and taking techniques.
Recently, Ko-bujutsu (traditional martial arts) movements are booming and applied in various field, like nursing. Kuzushi(breaking one's balance) technique is applied. It is a good example to learn a technique to beat someone. You learn yourself, others and human body.
This is one purpose of learning "techniques to beat someone".

Responsibility and determination

There is a word in Karate, Ichigeki hissatsu(one shot one kill). If someone is able to do it, her/his life will be over when she/he hits someone else.
A punch of amateur normally causes just minor injury.
But it will be totally different for her/him. She/he hits someone else for a reason, and killed the other. She/he could perform it too well, so she/he is a murder. So she/he need to understand how dangerous she/he is.
Learning techniques can be opportunities to learn responsibility and to review one's actions, and it leads to be better yourself. I sometimes feel mordern people need more determination of doing by oneself what one can do, before asking a help.
In Bushiki-juku, we practice to prepare for a dangerous situation. And this is to practice to mind the determination. "Determination" means to prepare for dangerous situations and practice for them.
Various difficulties come to us in modern life. To be "good person", we need capacity and mental strength to take those, and the determination is needed. I believe practice of budo is one way of learning the determination.