For me, it's like teaching religion without give the freedom of choice. If i just teach Adobe, what happens to the free tools? Why not teach both of them and let the students choose their own path?

Because it's the right thing to do.

So you can adapt easily.

Because they give freedom to whom use them.

Do you pay every time you eat fish, or have you already learnt how to use a fishing pole? Have you built one? Cool, let's share designs & improve together.

Because I believe in them!

Somebody has to do it ;)