"mainly hurting the community and the person"
Yes. But sometimes the life not give good options. And then we must choice
between two(or more) evils.
However, in this concrete case, we are still have hope for more optimistic
scenario. I will help him to install Adobe Flash plugin ONLY if libre
solutions will fail.
"It's not helping"
Analogy:
You are surgeon. You are have to amputate somebody leg, because otherwise the
person will die. Yes, you are harm the person. But otherwise, without
amputation will be much more harm.