When you start with a particular goal you can always find a graphic or chart to back it up.
Yes. The more data there are available, the easier it is to be selective with your sources. Charts and graphics are particularly vulnerable to this sort of manipulation because by their nature these visualisations are largely divested of context, and exist as standalone 'truths'. One way to direct us towards what is actually true could be the weight of consensus. If we assume that - taken as a whole - scientists are somewhat more impartial than media and politicians, then an overwhelming scientific consensus on a topic - such as human-caused climate change - can be convincing. Of course with Covid 19, data on confirmed cases and cause-of-death are highly subjective, and certainly politically manipulated, which makes the health effects of this pandemic particularly difficult to assess.