> If someone living today called themselves a capitalist would you expect them to be involved in "forcible seizure and defence"?

Given the diversification most capitalists have and looking at what major corporations do globally, yes, though I'd also expect them not to think of themselves that way.

Drug cartel leaders, I'm sure, often have similar self-serving rationalizations of their role.

>If someone living today called themselves a capitalist would you expect them to be involved in "forcible seizure and defence"?

Do you consider executives of, oh let's say, the Coca-Cola Company, to be capitalists?

From related portions of the economy: given the growing use of debtor's prisons, predatory loans, and coercive tactics including armed repossession & bounty hunting dependent on an exploitive for-profit bond regime? Yes. These are not companies rejected by modern capitalism. On a higher economic level private equity's leveraged buyouts are very frequently hostile takeovers that use a company's own resources to seize control of it.