During Shemittah year should I buy Arab produce or rely on heter mechira?

Written by Rav Bar-Hayim
Neither-Otzar beth din is the correct alternative which does
not involve strengthening the hold of our enemies on Eretz Yisrael
in any manner.

I despise the corruption and wickedness of the Knesset and the government of Israel. I don't see the point of voting for such an impure institution.

Written by Rav Bar-Hayim

One must separate one's emotions from rational thinking
 regarding the issue of voting. If good, pro-Torah, pro-Eretz Yisrael
Jews do not vote then we are abandoning the playing field and providing
our ideological opponents with more power.

What sin am i committing by choosing to purchase Arab produce during Shemittah year?

Written by Rav Bar-Hayim
Lo Tichanem. By purchasing such produce one
is helping to sustain our enemies and thereby strengthening
their hold on Eretz Yisrael.