This is not true. Have you ever voted for someone that you agree with 100%?
I did not say "agree with", I said support. If I vote for someone who supports a policy I don't agree with, I am supporting a policy that I don't agree with. And I have to be able to live with that. I can't pretend I didn't support it.
I can't vote for someone who wants to put kids in cages just because I want a lower corporate tax rate, and pretend I am not responsible. I can't vote for someone who wants kill women who get abortions because I call myself pro-life, and pretend I am not responsible for that.
So again:
When you vote for someone who supports these policies that does mean you support them. Even if you don't know you are supporting them. And even if you don't agree with them.
And I will go even further. If you don't vote for someone who opposes these policies, you are supporting these policies by default. Even if you don't want to support them.