You can't be convicted of being a terrorist by speaking out against the government. That is called Freedom of Speech. However if you act on it by blowing up a pipeline on behalf of environmental fanatics then you can be labeled a environmental terrorist. After all you caused danger to people's lives.
Burden of proof
(2) If an instrument referred to in subsection (1) prohibits the deprivation of citizenship that would render a person stateless, a person who claims that subsection 10(2) or 10.1(2) would operate in the manner described in subsection (1) must prove, on a balance of probabilities, that the person is not a citizen of any country of which the Minister has reasonable grounds to believe the person is a citizen.
The statement says that the person must prove to the minister that he/she cannot obtain another citizenship if the minister believe you have dual citizenship. Take for example. A Canadian born parent had a child in US. The child is American but didn't bother to register the child as Canadian. The child is also Canadian by law as well. Just didn't bother to go about to get it. This is what the burden of proof is for. An convicted terrorist may have legally obtained another citizenship by law, similar to Canadian citizenship law. So even though the person believed he/she holds single citizenship, when in fact, holds two citizenship or more. The only way the person would be legally holding single citizenship is by actually renouncing the other unintended citizenship. Look as Ted Cruz. He was considered by law, dual citizen, US and Canadian. He lived his life as an American but he is also Canadian by law. He had to officially renounce his Canadian citizenship.
So in summary, if you have another citizenship other than Canada obtained by foreign country's law such as by descent for example, as much as you want to preach to everyone that you are single citizenship holder, you do, in fact, hold dual citizenship. If you really want to a single citizenship holder, you must do your diligent to renounce any other citizenship obtained by law. In my case, I only hold Canadian citizenship. I cannot obtain any other foreign citizenship by law, even through my grandparents. So no worries for me being "REMOVED" according to you.
You do realized that sovereign citizens in US are considered to be domestic terror threat right? You do realized that some of them have been convicted on tax evasion in Canada because they haven't been paying income tax. And some of them have been driving without a license and insurance causing danger to public, right? So much for the safety of the public.