Open Sources VS Commercial

E-culture is made of various components : free-culture, love of technologies and the attraction that cames with a fresh market.
The Open source software are the outcome of the free-culture. Linus was the first famous one, challenging the monopole of Windows. Then came the peer-to-peer softwares, which were destinated to be a popular succes. Open office and Mozilla came later, and offered a credible alternative to expensives or unsatisfactory softwares.

The advantages are numerous : free, more reactive, good quality, tool to improve the general ability of the population on computering.
I see only one weakness : a hacker could do many damages via an open sources softwares.