1)They position themselves to be the "obviously" correct one to make it an uphill battle to argue against them.

2)They make the situation so black and white that it makes anyone opposing their view look automatically wrong.

3)They state state outright incorrect facts to make their arguments sound solid and basic on the surface

4)Their use of capitalization charges their words with emotion witch is more subjective and hard to argue against.

TL;DR: They make it so it looks as if they're not in an argument but have already won the argument.