Authentic conservatives don't elect people who tolerate or encourage subversion of our government. They certainly don't support the idea that Thomas Shannon, Assistant Secretary of State for Western Hemisphere Affairs, is traveling to foreign countries and telling the people there that the US is going to 'integrate' with them on a 'higher level'.
Throw up all the minutiae you want but, as long as anti-globalization protests are rightly associated in people's minds with communist sloganeering & burning American flags, few are going to care.
Personally, as a Canadian who admires the American ideal & has many family members Stateside, I welcome virtually anything which brings our nations closer together.
While we're both likely not big fans of Mexico, it would certainly be far easier to defend only coastal borders on 3 geographic sides:
(click image for some interesting statistics)