This term is very common and very generic on a world-scale: common in the sense that everyone can fight for their own individual causes no matter what they believe and generic in a sense that even a 4-year old kid can understand and has his/her own causes to fight for.
Your faith, your belief and your values define who you really are in every senses possible. It is not something absurd or even strange that we would like to step up and show our true strength to protect what we feel is important and necessary for us.
The fight is not only for the adults, not only for the politicians, and definitely not only for the leaders of the group. It is for everyone.
Stop undermining other’s determination and stop ruling them out just because it comes out of a kid 10 or 15 years younger than you. Things change fast these days, your old wisdom may not be adequate anymore.
Let them fight for their own causes and their own futures. We, as adults, only have to observe from afar and protect them when things turn catastrophic. Our support is what they need for their growth.
STOP pushing your thoughts towards them.
If you think they are too young, how old do you think Greta Thunberg was when she started the environment awareness protest?
Look what she has achieved. It’s even more than any regular adult could achieve in a lifetime.