translation please?

What does this say, just the general idea would be ok

 

I'm Spanish so this translation is going to be horrible.
''a Pitbull is considered good in combat because it can defeat bigger opponents. Jiu-Jitsu was also created for frail people to be able to defeat his opponents that are three times bigger and stronger.'' The last part is really difficult, but it says something in the lines of we are much more alike then what people think. And because of idiots we are both considered violent.

 

Thanks

 

The pit bull is considered the best combat dog, capable of beating opponents three times its size.
Jiu jitsu was also created to enable small men to defeat opponents three times bigger and stronger.
The other thing the two have in common is that because of certain idiots, both end up being considered violent.