In regard to DHS, the US court system found that DHS unlawfully created the rules for OPT in 2008 in backroom deals with industry lobbyists. When the court told them so, the DHS went in to "all hands on deck" mode to come up with a work around. (So far they've failed, putting ~130k OPT guest workers at risk of having to leave the country on Feb 12th 2016). Besides the question of what is DHS doing involving itself in student training programs and guest worker visas, but the other question is why wasn't what happened at Disney an "all hands on deck" situation? Where is the support for the citizens?
There are 62,000+ degrees in Computer Science alone awarded every year. With sample size 705 you are showing a decrease of 6% then p < 0.5. Further OPT program was established long before the "STEM Extension" came into effect during 2008. Finally in spite of STEM extension in place, the Software Developer jobs as well as salaries have recorded solid growth during 2008 - Now. Just because you became aware of the STEM program due to a judgement on a minor procedural issue, does not invalidates the robust job and salary growth over the last 7 years enjoyed by the profession. You are simply trying to map your flawed beliefs and sensational news reports to justify non existent decline.
Why should citizens be treated differently when H1Bs pay the same income and other taxes as citizens? H1Bs even pay into social security, even though they are on a temporary visa.
Anyone who pays the same tax as citizens should be treated the same as citizens.
There aren't any new recent moves by DHS regarding "OPTs". The proposed change in "STEM Extension", won't come into affect at least until mid 2016.