I'm in favor of using BIP148 to force the activation of segwit by August 1st. I'm not just in favor of it, I'm willing to go to extremes to make sure that it happens, consequences be damned. I will not compromise, I will not accept the status quo, and I will not back down. Not only that, I'm going to force you to support it too. To make things even more absurd, I think that you should be just as fanatical about it as I am, because that will lead to the best outcome for everyone.
Why am I doing this? I'm normally a fairly moderate, reasonable person. However, the game theory governing this situation is such that, perversely, caution is dangerous. Balls to the wall extremism is the only sane choice.
There is massive demand for segwit, which isn't going to go away.
BIP148 is the only plausible way to get segwit to activate without waiting another year and a half.
The risk profile of supporting BIP148 vs supporting the legacy chain in a chain split scenario is skewed in favor of BIP148. Much of the risk is borne by the network as a whole, rather than by the BIP148 supporters themselves.
Given the above points, BIP148 will inevitably be attempted. It has a large and growing number of supporters, many of them hardliners like myself.
BIP148 becomes safer as it gains more support. The risk of a chain split is lessened, and any chain split that does occur will be shorter. A swift and decisive BIP148 victory is best for everyone. Resistance will only make the transition more painful.
This is a situation where the outcome will be determined not by the moderate or apathetic majority, but by the intolerant minority. The hardliners will back BIP148 even if it causes a disastrous persistent chain split. This denies the moderate supporters the ability to back out, since the reduced support would just make the chain split more likely and damaging to everyone. As we grow more numerous and intolerant, we gradually force the neutral majority to also back BIP148 in order to avoid a split. The more hardliners there are, the faster this process will happen, and the safer the transition will be.
TL;DR- BIP148 is happening whether you like it or not. Get in.