I don't begrudge nonbelievers and never have. There's reason for doubt, and I've always acknowledged that fact. It's the condescension and constant ridicule of believers that bothers me, and I normally don't bother with said types of skeptics (aside from perhaps trolling a bit) because it's simply a fruitless endeavor. Nobody wants to talk much with assholes when discussing anything, be it Bigfoot, physics, biology, etc.
When talking about evidence, I think it's important to view it in its entirety. This means taking into account all the eyewitness reports (of which there are thousands - The Late John Green compiled a pretty extensive database, I'll link an interview with him below), all of the supposed video and image captures of varying quality, and all of the trackway/print evidence. There's also exists questionable skat and hair samples, but they're classified as unknown animal because you can't cross check them with anything confirmed. It's the sheer amount of soft evidence that makes a compelling case, especially given the ecological and biological grounds for their existence being more than suitable.
They do alter their environments, BTW. They leave sign just like any other animal, you just have to know what to look for. They often mark their territories like deer do. Tree branch twisting is a common example. Another is the breaking over of a sapling at a height of which they can reach, which indicates their presence to others - much like bears that scratch off bark to warn others that they rule the region.
Keep in mind that only one story/track/video/image out of all of them has to be real. Just one.
Still, without the hard evidence (a body or substantial part of one being hand delivered into the proper scientific establishment, which is then made public) the case remains unsolved - and understandably so.
This is often why I urge people to set aside their bias about the potential for conspiracy and see what they come up with if they work backwards from the assumed position that the creatures exist, and if they do, how is it that it's still, to this date, unconfirmed. That, to me, is where this entire thing really gets interesting (But, admittedly, that's perhaps because I've moved on from a position of uncertainty).
John Green
For anyone interested, Bigfoot Eyewitness Radio is a good YT channel for getting into eyewitness reports.