For sure, I can understand how all kinds of mixed feelings can arise on all number of considerations (such is the marvelously agitated orientation of the mind
). I personally, have no clue about these monks, their intentions and so on, and only heard about the Walk for Peace via a casual reference from Ven. Bhikkhu Bodhi at the end of an online sutta class he led on Saturday.
While not knowing myself—in fact, all the more, because of that—I think it might be worth taking extra care in representation on the following point, and pausing to be sure we have the right understanding:
After hearing about the walk, intrigued, I did a bit of a Googlaroo and also discovered the Stupa project. However, I didn’t automatically associate it with the walk. At least while not having cause to do otherwise, I was inclined to just understand that the monk leading the walk also started a stupa project a few years ago.
As they are hosting some of the walk info on the Dhammacetiya website there is fair room for questions about how tied these two things are, but it could also just be a technical convenience (which is at least to some degree supported by a glance through the site’s news archive that shares all kinds of general news, and is not just exclusively focused on the stupa project).
In the route link you shared, they point to the dedicated Walk for Peace Facebook page as the source of truth. The map says:
For all information and updates of the journey, please visit us here: https://facebook.com/walkforpeaceusa
Much as I’m loath to enter, or promote the Zuckerverse, this is perhaps a worthy exception. The intro given there states:
Official Page of Walk for Peace, the 120-day, 2,300-mile journey by Buddhist monks — with loyal dog, Aloka — walking from Fort Worth, Texas, to Washington, D.C. to raise awareness of peace, loving kindness, and compassion across America and the world. 
Under the links given there, the specific page for the walk is given (https://dhammacetiya.com/walk-for-peace/) rather than the Dhammacetiya home page. A Zeffy link is also given and the description for that gives:
The Walk for Peace began on October 26, 2025, at the Huong Dao Vipassana Bhavana Center.
This journey will span approximately 2,300 miles (3,701 kilometers), at a mindful pace of 20–23 miles per day. This is not a protest — it is a living expression of hope. Each step is taken with mindfulness, carrying a message of harmony, kindness, and resilience.
To fulfill this vision, we seek the support and participation of everyone — regardless of background or belief. With your compassion, The Walk for Peace can unfold with dignity and become a meaningful contribution to all who seek peace.
At Huong Dao Vipassana Bhavana Center Inc., we believe that change begins with each of us. Every act of kindness, every moment of peace, and every bit of mindful support bring us closer to a more compassionate world.
No mention of stupas.
Putting these things together, I’d feel quite hesitant about describing it as a “Dhammacetiya Walk for Peace”, and feel it more suitable to say, “Monks of Huong Dao Walk for Peace”. At least without clearer evidence to the contrary, I think it would be quite uncharitable not to allow that attention brought to the the stupa project may be more a peripheral side effect rather than a primary purpose of this endeavour.
From the representations I have thus far seen, at face value it would seem to be fair to characterize the chief interest in this particular undertaking as being to encourage individuals to turn inwards to create both inner and outer peace. Beautiful as it is, I don’t even feel this is an uncomplicated invitation. At the same time, reflecting on how spectacularly complicated samsara’s invitation is, I’d suggest there are many worse things.