Yes, it is a common excuse in e.g. non-democracies to call democracy activists for terrorists (often combined with claims that all the democratic countries are in a conspiracy against them, because we hate Russia/Pakistan/Iran/etc.)

And no, if there is a terrorism problem scaring voters the politicians are empirically motivated to fix it -- see my examples of throwing out the law book -- or it isn't a democracy. [Edit: To be clear, I think the Drug War etc are different; propaganda -- not really about scared voters.]