Because ocdtrekkie was using Microsoft's open source strategy to imply that Microsoft is no longer pursuing the same goals as before. EugeneOZ explained that Microsoft's strategy does not preclude their earlier goals.

Because it's important to distinct intention to contribute to open-source world and intention to use this world to make money.

It's sad to see that despite open source (or free/libre..etc) software being around for so long, people still don't get it that money and freedom are not mutually exclusive. I would argue that contributing to open source for business reasons is perhaps even more beneficial for the software and community than just doing it for a hobby or some philosophy because companies pay people to even work on stuff that is not exciting / interesting.

sad to see that people still thinks "it's sad to see" that somebody can have different opinion.

Huh? I acknowledge that you have a different opinion and I'm saddened by that opinion.

I respect your right to have a different opinion. I don't have to respect the opinion itself. Hope you can see the difference.

As if these were orthogonal. My employer encourages me to contribute to open-source precisely because the open-source tools are the best for the job and thus allow us to make more money.

It's absolutely different case. Microsoft don't care if tools they use will be open-source or free - no. They only care if they can attract developers by playing role of "openSource company". It's not your case.