If you don’t realise why killing political support for your cause is bad, by all means, keep doing what you’re doing. If you want to affect real change, be nice to the people from whom you want votes. Democracy requires discussion and compromise. Pissing on your allies does the opposite of what you want.
That democracy doesn’t work that way? Okay, if convincing people to vote for your cause doesn’t work in a democracy, how does it work?