Yes, electors in Texas are compelled to represent the results of the Texas vote irrespective of how the people voted in California. An idiosyncratic system by Canadian standards. Canada's system is, no doubt, idiosyncratic by American standards. Once again, the inherent political arrogance of Canada in fine form.
a) No one is apologizing for Trump winning. Whatever gave you that idea?
b) No one has to justify continuing the current US constitution, least of all those whose candidate won. The people who advocate electing the president based on the national vote bear the onus of convincing politicians to amend the constitution. So far, nothing really convincing on that account that I've read. Different results, different problems - not BETTER results on an indisputable analysis.
c) I'm sure Trump will accept the same numbers, with the same results in 2020, including losing the popular vote by 3 mil. There will be no change to the constitution on this point by 2020 (if ever).